Finite Math Examples

$\frac{1}{x} + \frac{1}{y} + \frac{1}{z} = \frac{1}{15}$ , $\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$ , $\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1

Solve for $x$ in $\frac{1}{x} + \frac{1}{y} + \frac{1}{z} = \frac{1}{15}$ .

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Step 1.1

Move all terms not containing $x$ to the right side of the equation.

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Step 1.1.1

Subtract $\frac{1}{y}$ from both sides of the equation.

$\frac{1}{x} + \frac{1}{z} = \frac{1}{15} - \frac{1}{y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.1.2

Subtract $\frac{1}{z}$ from both sides of the equation.

$\frac{1}{x} = \frac{1}{15} - \frac{1}{y} - \frac{1}{z}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

$\frac{1}{x} = \frac{1}{15} - \frac{1}{y} - \frac{1}{z}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.2

Find the LCD of the terms in the equation.

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Step 1.2.1

Finding the LCD of a list of values is the same as finding the LCM of the denominators of those values.

$x, 15, y, z$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.2.2

Since $x, 15, y, z$ contains both numbers and variables, there are two steps to find the LCM. Find LCM for the numeric part $1, 15, 1, 1$ then find LCM for the variable part $x^{1}, y^{1}, z^{1}$ .

Since $x, 15, y, z$ contains both numbers and variables, there are two steps to find the LCM. Find LCM for the numeric part $1, 15, 1, 1$ then find LCM for the variable part x,y,z.

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.2.3

The LCM is the smallest positive number that all of the numbers divide into evenly.

$1$ List the prime factors of each number.

$2$ Multiply each factor the greatest number of times it occurs in either number.

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.2.4

The number $1$ is not a prime number because it only has one positive factor, which is itself.

Not prime

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.2.5

$15$ has factors of $3$ and $5$ .

$3 \cdot 5$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.2.6

The number $1$ is not a prime number because it only has one positive factor, which is itself.

Not prime

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.2.7

The LCM of $1, 15, 1, 1$ is the result of multiplying all prime factors the greatest number of times they occur in either number.

$3 \cdot 5$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.2.8

Multiply $3$ by $5$ .

$15$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.2.9

The factor for $x^{1}$ is $x$ itself.

$x = x$

x occurs $1$ time.

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.2.10

The factor for $y^{1}$ is $y$ itself.

$y = y$

y occurs $1$ time.

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.2.11

The factor for $z^{1}$ is $z$ itself.

$z = z$

z occurs $1$ time.

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.2.12

The LCM of $x^{1}, y^{1}, z^{1}$ is the result of multiplying all prime factors the greatest number of times they occur in either term.

$x \cdot y \cdot z$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.2.13

Multiply $x y$ by $z$ .

$x y z$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.2.14

The LCM for $x, 15, y, z$ is the numeric part $15$ multiplied by the variable part.

$15 x y z$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

$15 x y z$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3

Multiply each term in $\frac{1}{x} = \frac{1}{15} - \frac{1}{y} - \frac{1}{z}$ by $15 x y z$ to eliminate the fractions.

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Step 1.3.1

Multiply each term in $\frac{1}{x} = \frac{1}{15} - \frac{1}{y} - \frac{1}{z}$ by $15 x y z$ .

$\frac{1}{x} \cdot (15 x y z) = \frac{1}{15} \cdot (15 x y z) - \frac{1}{y} \cdot (15 x y z) - \frac{1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3.2

Simplify the left side.

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Step 1.3.2.1

Rewrite using the commutative property of multiplication.

$15 (\frac{1}{x}) \cdot (x y z) = \frac{1}{15} \cdot (15 x y z) - \frac{1}{y} \cdot (15 x y z) - \frac{1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3.2.2

Combine $15$ and $\frac{1}{x}$ .

$\frac{15}{x} \cdot (x y z) = \frac{1}{15} \cdot (15 x y z) - \frac{1}{y} \cdot (15 x y z) - \frac{1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3.2.3

Cancel the common factor of $x$ .

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Step 1.3.2.3.1

Factor $x$ out of $x y z$ .

$\frac{15}{x} \cdot (x (y z)) = \frac{1}{15} \cdot (15 x y z) - \frac{1}{y} \cdot (15 x y z) - \frac{1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3.2.3.2

Cancel the common factor.

$\frac{15}{x} \cdot (x (y z)) = \frac{1}{15} \cdot (15 x y z) - \frac{1}{y} \cdot (15 x y z) - \frac{1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3.2.3.3

Rewrite the expression.

$15 (y z) = \frac{1}{15} \cdot (15 x y z) - \frac{1}{y} \cdot (15 x y z) - \frac{1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

$15 y z = \frac{1}{15} \cdot (15 x y z) - \frac{1}{y} \cdot (15 x y z) - \frac{1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

$15 y z = \frac{1}{15} \cdot (15 x y z) - \frac{1}{y} \cdot (15 x y z) - \frac{1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3.3

Simplify the right side.

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Step 1.3.3.1

Simplify each term.

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Step 1.3.3.1.1

Cancel the common factor of $15$ .

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Step 1.3.3.1.1.1

Factor $15$ out of $15 x y z$ .

$15 y z = \frac{1}{15} \cdot (15 (x y z)) - \frac{1}{y} \cdot (15 x y z) - \frac{1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3.3.1.1.2

Cancel the common factor.

$15 y z = \frac{1}{15} \cdot (15 (x y z)) - \frac{1}{y} \cdot (15 x y z) - \frac{1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3.3.1.1.3

Rewrite the expression.

$15 y z = x y z - \frac{1}{y} \cdot (15 x y z) - \frac{1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

$15 y z = x y z - \frac{1}{y} \cdot (15 x y z) - \frac{1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3.3.1.2

Cancel the common factor of $y$ .

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Step 1.3.3.1.2.1

Move the leading negative in $- \frac{1}{y}$ into the numerator.

$15 y z = x y z + \frac{- 1}{y} \cdot (15 x y z) - \frac{1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3.3.1.2.2

Factor $y$ out of $15 x y z$ .

$15 y z = x y z + \frac{- 1}{y} \cdot (y (15 x z)) - \frac{1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3.3.1.2.3

Cancel the common factor.

$15 y z = x y z + \frac{- 1}{y} \cdot (y (15 x z)) - \frac{1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3.3.1.2.4

Rewrite the expression.

$15 y z = x y z - (15 x z) - \frac{1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

$15 y z = x y z - (15 x z) - \frac{1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3.3.1.3

Multiply $15$ by $- 1$ .

$15 y z = x y z - 15 (x z) - \frac{1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3.3.1.4

Cancel the common factor of $z$ .

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Step 1.3.3.1.4.1

Move the leading negative in $- \frac{1}{z}$ into the numerator.

$15 y z = x y z - 15 x z + \frac{- 1}{z} \cdot (15 x y z)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3.3.1.4.2

Factor $z$ out of $15 x y z$ .

$15 y z = x y z - 15 x z + \frac{- 1}{z} \cdot (z (15 x y))$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3.3.1.4.3

Cancel the common factor.

$15 y z = x y z - 15 x z + \frac{- 1}{z} \cdot (z (15 x y))$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3.3.1.4.4

Rewrite the expression.

$15 y z = x y z - 15 x z - (15 x y)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

$15 y z = x y z - 15 x z - (15 x y)$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.3.3.1.5

Multiply $15$ by $- 1$ .

$15 y z = x y z - 15 x z - 15 x y$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

$15 y z = x y z - 15 x z - 15 x y$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

$15 y z = x y z - 15 x z - 15 x y$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

$15 y z = x y z - 15 x z - 15 x y$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.4

Solve the equation.

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Step 1.4.1

Rewrite the equation as $x y z - 15 x z - 15 x y = 15 y z$ .

$x y z - 15 x z - 15 x y = 15 y z$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.4.2

Factor $x$ out of $x y z - 15 x z - 15 x y$ .

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Step 1.4.2.1

Factor $x$ out of $x y z$ .

$x (y z) - 15 x z - 15 x y = 15 y z$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.4.2.2

Factor $x$ out of $- 15 x z$ .

$x (y z) + x (- 15 z) - 15 x y = 15 y z$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.4.2.3

Factor $x$ out of $- 15 x y$ .

$x (y z) + x (- 15 z) + x (- 15 y) = 15 y z$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.4.2.4

Factor $x$ out of $x (y z) + x (- 15 z)$ .

$x (y z - 15 z) + x (- 15 y) = 15 y z$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.4.2.5

Factor $x$ out of $x (y z - 15 z) + x (- 15 y)$ .

$x (y z - 15 z - 15 y) = 15 y z$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

$x (y z - 15 z - 15 y) = 15 y z$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.4.3

Divide each term in $x (y z - 15 z - 15 y) = 15 y z$ by $y z - 15 z - 15 y$ and simplify.

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Step 1.4.3.1

Divide each term in $x (y z - 15 z - 15 y) = 15 y z$ by $y z - 15 z - 15 y$ .

$\frac{x (y z - 15 z - 15 y)}{y z - 15 z - 15 y} = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.4.3.2

Simplify the left side.

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Step 1.4.3.2.1

Cancel the common factor of $y z - 15 z - 15 y$ .

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Step 1.4.3.2.1.1

Cancel the common factor.

$\frac{x (y z - 15 z - 15 y)}{y z - 15 z - 15 y} = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 1.4.3.2.1.2

Divide $x$ by $1$ .

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$

Step 2

Replace all occurrences of $x$ with $\frac{15 y z}{y z - 15 z - 15 y}$ in each equation.

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Step 2.1

Replace all occurrences of $x$ in $\frac{18}{x} + \frac{18}{y} + \frac{12}{z} = 1$ with $\frac{15 y z}{y z - 15 z - 15 y}$ .

$\frac{18}{\frac{15 y z}{y z - 15 z - 15 y}} + \frac{18}{y} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2

Simplify the left side.

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Step 2.2.1

Simplify $\frac{18}{\frac{15 y z}{y z - 15 z - 15 y}} + \frac{18}{y} + \frac{12}{z}$ .

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Step 2.2.1.1

Simplify each term.

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Step 2.2.1.1.1

Multiply the numerator by the reciprocal of the denominator.

$18 (\frac{y z - 15 z - 15 y}{15 y z}) + \frac{18}{y} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.1.2

Cancel the common factor of $3$ .

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Step 2.2.1.1.2.1

Factor $3$ out of $18$ .

$3 (6) (\frac{y z - 15 z - 15 y}{15 y z}) + \frac{18}{y} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.1.2.2

Factor $3$ out of $15 y z$ .

$3 (6) (\frac{y z - 15 z - 15 y}{3 (5 y z)}) + \frac{18}{y} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.1.2.3

Cancel the common factor.

$3 \cdot (6 (\frac{y z - 15 z - 15 y}{3 (5 y z)})) + \frac{18}{y} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.1.2.4

Rewrite the expression.

$6 (\frac{y z - 15 z - 15 y}{5 y z}) + \frac{18}{y} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$6 (\frac{y z - 15 z - 15 y}{5 y z}) + \frac{18}{y} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.1.3

Combine $6$ and $\frac{y z - 15 z - 15 y}{5 y z}$ .

$\frac{6 (y z - 15 z - 15 y)}{5 y z} + \frac{18}{y} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{6 (y z - 15 z - 15 y)}{5 y z} + \frac{18}{y} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.2

To write $\frac{18}{y}$ as a fraction with a common denominator, multiply by $\frac{5 z}{5 z}$ .

$\frac{6 (y z - 15 z - 15 y)}{5 y z} + \frac{18}{y} \cdot \frac{5 z}{5 z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.3

Write each expression with a common denominator of $5 y z$ , by multiplying each by an appropriate factor of $1$ .

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Step 2.2.1.3.1

Multiply $\frac{18}{y}$ by $\frac{5 z}{5 z}$ .

$\frac{6 (y z - 15 z - 15 y)}{5 y z} + \frac{18 (5 z)}{y (5 z)} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.3.2

Reorder the factors of $y (5 z)$ .

$\frac{6 (y z - 15 z - 15 y)}{5 y z} + \frac{18 (5 z)}{5 y z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{6 (y z - 15 z - 15 y)}{5 y z} + \frac{18 (5 z)}{5 y z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.4

Combine the numerators over the common denominator.

$\frac{6 (y z - 15 z - 15 y) + 18 (5 z)}{5 y z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.5

Simplify each term.

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Step 2.2.1.5.1

Simplify the numerator.

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Step 2.2.1.5.1.1

Factor $6$ out of $6 (y z - 15 z - 15 y) + 18 \cdot 5 z$ .

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Step 2.2.1.5.1.1.1

Factor $6$ out of $18 \cdot 5 z$ .

$\frac{6 (y z - 15 z - 15 y) + 6 (3 \cdot (5 z))}{5 y z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.5.1.1.2

Factor $6$ out of $6 (y z - 15 z - 15 y) + 6 (3 \cdot 5 z)$ .

$\frac{6 (y z - 15 z - 15 y + 3 \cdot (5 z))}{5 y z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{6 (y z - 15 z - 15 y + 3 \cdot (5 z))}{5 y z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.5.1.2

Multiply $3$ by $5$ .

$\frac{6 (y z - 15 z - 15 y + 15 z)}{5 y z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.5.1.3

Add $- 15 z$ and $15 z$ .

$\frac{6 (y z - 15 y + 0)}{5 y z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.5.1.4

Add $y z - 15 y$ and $0$ .

$\frac{6 (y z - 15 y)}{5 y z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.5.1.5

Factor $y$ out of $y z - 15 y$ .

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Step 2.2.1.5.1.5.1

Factor $y$ out of $y z$ .

$\frac{6 (y (z) - 15 y)}{5 y z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.5.1.5.2

Factor $y$ out of $- 15 y$ .

$\frac{6 (y (z) + y \cdot - 15)}{5 y z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.5.1.5.3

Factor $y$ out of $y (z) + y \cdot - 15$ .

$\frac{6 (y (z - 15))}{5 y z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{6 y (z - 15)}{5 y z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{6 y (z - 15)}{5 y z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.5.2

Cancel the common factor of $y$ .

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Step 2.2.1.5.2.1

Cancel the common factor.

$\frac{6 y (z - 15)}{5 y z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.5.2.2

Rewrite the expression.

$\frac{6 (z - 15)}{5 z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{6 (z - 15)}{5 z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{6 (z - 15)}{5 z} + \frac{12}{z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.6

To write $\frac{12}{z}$ as a fraction with a common denominator, multiply by $\frac{5}{5}$ .

$\frac{6 (z - 15)}{5 z} + \frac{12}{z} \cdot \frac{5}{5} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.7

Write each expression with a common denominator of $5 z$ , by multiplying each by an appropriate factor of $1$ .

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Step 2.2.1.7.1

Multiply $\frac{12}{z}$ by $\frac{5}{5}$ .

$\frac{6 (z - 15)}{5 z} + \frac{12 \cdot 5}{z \cdot 5} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.7.2

Reorder the factors of $z \cdot 5$ .

$\frac{6 (z - 15)}{5 z} + \frac{12 \cdot 5}{5 z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{6 (z - 15)}{5 z} + \frac{12 \cdot 5}{5 z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.8

Combine the numerators over the common denominator.

$\frac{6 (z - 15) + 12 \cdot 5}{5 z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.9

Simplify the numerator.

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Step 2.2.1.9.1

Factor $6$ out of $6 (z - 15) + 12 \cdot 5$ .

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Step 2.2.1.9.1.1

Factor $6$ out of $12 \cdot 5$ .

$\frac{6 (z - 15) + 6 (2 \cdot 5)}{5 z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.9.1.2

Factor $6$ out of $6 (z - 15) + 6 (2 \cdot 5)$ .

$\frac{6 (z - 15 + 2 \cdot 5)}{5 z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{6 (z - 15 + 2 \cdot 5)}{5 z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.9.2

Multiply $2$ by $5$ .

$\frac{6 (z - 15 + 10)}{5 z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 2.2.1.9.3

Add $- 15$ and $10$ .

$\frac{6 (z - 5)}{5 z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{6 (z - 5)}{5 z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{6 (z - 5)}{5 z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{6 (z - 5)}{5 z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{6 (z - 5)}{5 z} = 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 3

Solve for $z$ in $\frac{6 (z - 5)}{5 z} = 1$ .

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Step 3.1

Find the LCD of the terms in the equation.

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Step 3.1.1

Finding the LCD of a list of values is the same as finding the LCM of the denominators of those values.

$5 z, 1$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 3.1.2

The LCM of one and any expression is the expression.

$5 z$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$5 z$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 3.2

Multiply each term in $\frac{6 (z - 5)}{5 z} = 1$ by $5 z$ to eliminate the fractions.

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Step 3.2.1

Multiply each term in $\frac{6 (z - 5)}{5 z} = 1$ by $5 z$ .

$\frac{6 (z - 5)}{5 z} \cdot (5 z) = 1 (5 z)$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 3.2.2

Simplify the left side.

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Step 3.2.2.1

Rewrite using the commutative property of multiplication.

$5 (\frac{6 (z - 5)}{5 z}) \cdot z = 1 (5 z)$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 3.2.2.2

Cancel the common factor of $5$ .

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Step 3.2.2.2.1

Factor $5$ out of $5 z$ .

$5 (\frac{6 (z - 5)}{5 (z)}) \cdot z = 1 (5 z)$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 3.2.2.2.2

Cancel the common factor.

$5 (\frac{6 (z - 5)}{5 z}) \cdot z = 1 (5 z)$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 3.2.2.2.3

Rewrite the expression.

$\frac{6 (z - 5)}{z} \cdot z = 1 (5 z)$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$\frac{6 (z - 5)}{z} \cdot z = 1 (5 z)$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 3.2.2.3

Cancel the common factor of $z$ .

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Step 3.2.2.3.1

Cancel the common factor.

$\frac{6 (z - 5)}{z} \cdot z = 1 (5 z)$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 3.2.2.3.2

Rewrite the expression.

$6 (z - 5) = 1 (5 z)$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$6 (z - 5) = 1 (5 z)$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 3.2.2.4

Apply the distributive property.

$6 z + 6 \cdot - 5 = 1 (5 z)$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 3.2.2.5

Multiply $6$ by $- 5$ .

$6 z - 30 = 1 (5 z)$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$6 z - 30 = 1 (5 z)$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 3.2.3

Simplify the right side.

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Step 3.2.3.1

Multiply $5 z$ by $1$ .

$6 z - 30 = 5 z$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$6 z - 30 = 5 z$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$6 z - 30 = 5 z$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 3.3

Solve the equation.

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Step 3.3.1

Move all terms containing $z$ to the left side of the equation.

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Step 3.3.1.1

Subtract $5 z$ from both sides of the equation.

$6 z - 30 - 5 z = 0$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 3.3.1.2

Subtract $5 z$ from $6 z$ .

$z - 30 = 0$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$z - 30 = 0$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 3.3.2

Add $30$ to both sides of the equation.

$z = 30$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$z = 30$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$z = 30$

$x = \frac{15 y z}{y z - 15 z - 15 y}$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 4

Replace all occurrences of $z$ with $30$ in each equation.

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Step 4.1

Replace all occurrences of $z$ in $x = \frac{15 y z}{y z - 15 z - 15 y}$ with $30$ .

$x = \frac{15 y (30)}{y (30) - 15 \cdot 30 - 15 y}$

$z = 30$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 4.2

Simplify the right side.

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Step 4.2.1

Simplify $\frac{15 y (30)}{y (30) - 15 \cdot 30 - 15 y}$ .

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Step 4.2.1.1

Cancel the common factor of $15$ and $y (30) - 15 \cdot 30 - 15 y$ .

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Step 4.2.1.1.1

Factor $15$ out of $15 y (30)$ .

$x = \frac{15 (y \cdot (30))}{y (30) - 15 \cdot 30 - 15 y}$

$z = 30$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 4.2.1.1.2

Cancel the common factors.

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Step 4.2.1.1.2.1

Factor $15$ out of $y (30)$ .

$x = \frac{15 (y \cdot (30))}{15 (y \cdot (2)) - 15 \cdot 30 - 15 y}$

$z = 30$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 4.2.1.1.2.2

Factor $15$ out of $- 15 \cdot 30$ .

$x = \frac{15 (y \cdot (30))}{15 (y \cdot (2)) + 15 (- 1 \cdot 30) - 15 y}$

$z = 30$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 4.2.1.1.2.3

Factor $15$ out of $15 (y \cdot (2)) + 15 (- 1 \cdot 30)$ .

$x = \frac{15 (y \cdot (30))}{15 (y \cdot (2) - 1 \cdot 30) - 15 y}$

$z = 30$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 4.2.1.1.2.4

Factor $15$ out of $- 15 y$ .

$x = \frac{15 (y \cdot (30))}{15 (y \cdot (2) - 1 \cdot 30) + 15 (- y)}$

$z = 30$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 4.2.1.1.2.5

Factor $15$ out of $15 (y \cdot (2) - 1 \cdot 30) + 15 (- y)$ .

$x = \frac{15 (y \cdot (30))}{15 (y \cdot (2) - 1 \cdot 30 - y)}$

$z = 30$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 4.2.1.1.2.6

Cancel the common factor.

$x = \frac{15 (y \cdot (30))}{15 (y \cdot (2) - 1 \cdot 30 - y)}$

$z = 30$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 4.2.1.1.2.7

Rewrite the expression.

$x = \frac{y \cdot (30)}{y \cdot (2) - 1 \cdot 30 - y}$

$z = 30$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$x = \frac{y \cdot (30)}{y \cdot (2) - 1 \cdot 30 - y}$

$z = 30$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$x = \frac{y \cdot (30)}{y \cdot (2) - 1 \cdot 30 - y}$

$z = 30$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 4.2.1.2

Simplify the denominator.

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Step 4.2.1.2.1

Move $2$ to the left of $y$ .

$x = \frac{y \cdot (30)}{2 y - 1 \cdot 30 - y}$

$z = 30$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 4.2.1.2.2

Multiply $- 1$ by $30$ .

$x = \frac{y \cdot (30)}{2 y - 30 - y}$

$z = 30$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 4.2.1.2.3

Subtract $y$ from $2 y$ .

$x = \frac{y \cdot (30)}{y - 30}$

$z = 30$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$x = \frac{y \cdot (30)}{y - 30}$

$z = 30$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 4.2.1.3

Move $30$ to the left of $y$ .

$x = \frac{30 y}{y - 30}$

$z = 30$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$x = \frac{30 y}{y - 30}$

$z = 30$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

$x = \frac{30 y}{y - 30}$

$z = 30$

$\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$

Step 4.3

Replace all occurrences of $z$ in $\frac{1}{y} + \frac{1}{z} = \frac{1}{20}$ with $30$ .

$\frac{1}{y} + \frac{1}{30} = \frac{1}{20}$

$x = \frac{30 y}{y - 30}$

$z = 30$

$\frac{1}{y} + \frac{1}{30} = \frac{1}{20}$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5

Solve for $y$ in $\frac{1}{y} + \frac{1}{30} = \frac{1}{20}$ .

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Step 5.1

Move all terms not containing $y$ to the right side of the equation.

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Step 5.1.1

Subtract $\frac{1}{30}$ from both sides of the equation.

$\frac{1}{y} = \frac{1}{20} - \frac{1}{30}$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.1.2

To write $\frac{1}{20}$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$\frac{1}{y} = \frac{1}{20} \cdot \frac{3}{3} - \frac{1}{30}$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.1.3

To write $- \frac{1}{30}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$\frac{1}{y} = \frac{1}{20} \cdot \frac{3}{3} - \frac{1}{30} \cdot \frac{2}{2}$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.1.4

Write each expression with a common denominator of $60$ , by multiplying each by an appropriate factor of $1$ .

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Step 5.1.4.1

Multiply $\frac{1}{20}$ by $\frac{3}{3}$ .

$\frac{1}{y} = \frac{3}{20 \cdot 3} - \frac{1}{30} \cdot \frac{2}{2}$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.1.4.2

Multiply $20$ by $3$ .

$\frac{1}{y} = \frac{3}{60} - \frac{1}{30} \cdot \frac{2}{2}$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.1.4.3

Multiply $\frac{1}{30}$ by $\frac{2}{2}$ .

$\frac{1}{y} = \frac{3}{60} - \frac{2}{30 \cdot 2}$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.1.4.4

Multiply $30$ by $2$ .

$\frac{1}{y} = \frac{3}{60} - \frac{2}{60}$

$x = \frac{30 y}{y - 30}$

$z = 30$

$\frac{1}{y} = \frac{3}{60} - \frac{2}{60}$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.1.5

Combine the numerators over the common denominator.

$\frac{1}{y} = \frac{3 - 2}{60}$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.1.6

Subtract $2$ from $3$ .

$\frac{1}{y} = \frac{1}{60}$

$x = \frac{30 y}{y - 30}$

$z = 30$

$\frac{1}{y} = \frac{1}{60}$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.2

Find the LCD of the terms in the equation.

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Step 5.2.1

Finding the LCD of a list of values is the same as finding the LCM of the denominators of those values.

$y, 60$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.2.2

Since $y, 60$ contains both numbers and variables, there are two steps to find the LCM. Find LCM for the numeric part $1, 60$ then find LCM for the variable part $y^{1}$ .

Since $y, 60$ contains both numbers and variables, there are two steps to find the LCM. Find LCM for the numeric part $1, 60$ then find LCM for the variable part y.

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.2.3

The LCM is the smallest positive number that all of the numbers divide into evenly.

$1$ List the prime factors of each number.

$2$ Multiply each factor the greatest number of times it occurs in either number.

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.2.4

The number $1$ is not a prime number because it only has one positive factor, which is itself.

Not prime

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.2.5

The prime factors for $60$ are $2 \cdot 2 \cdot 3 \cdot 5$ .

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Step 5.2.5.1

$60$ has factors of $2$ and $30$ .

$2 \cdot 30$

Step 5.2.5.2

$30$ has factors of $2$ and $15$ .

$2 \cdot 2 \cdot 15$

Step 5.2.5.3

$15$ has factors of $3$ and $5$ .

$2 \cdot 2 \cdot 3 \cdot 5$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.2.6

Multiply $2 \cdot 2 \cdot 3 \cdot 5$ .

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Step 5.2.6.1

Multiply $2$ by $2$ .

$4 \cdot 3 \cdot 5$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.2.6.2

Multiply $4$ by $3$ .

$12 \cdot 5$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.2.6.3

Multiply $12$ by $5$ .

$60$

$x = \frac{30 y}{y - 30}$

$z = 30$

$60$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.2.7

The factor for $y^{1}$ is $y$ itself.

$y = y$

y occurs $1$ time.

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.2.8

The LCM of $y^{1}$ is the result of multiplying all prime factors the greatest number of times they occur in either term.

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.2.9

The LCM for $y, 60$ is the numeric part $60$ multiplied by the variable part.

$60 y$

$x = \frac{30 y}{y - 30}$

$z = 30$

$60 y$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.3

Multiply each term in $\frac{1}{y} = \frac{1}{60}$ by $60 y$ to eliminate the fractions.

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Step 5.3.1

Multiply each term in $\frac{1}{y} = \frac{1}{60}$ by $60 y$ .

$\frac{1}{y} \cdot (60 y) = \frac{1}{60} \cdot (60 y)$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.3.2

Simplify the left side.

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Step 5.3.2.1

Rewrite using the commutative property of multiplication.

$60 (\frac{1}{y}) \cdot y = \frac{1}{60} \cdot (60 y)$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.3.2.2

Combine $60$ and $\frac{1}{y}$ .

$\frac{60}{y} \cdot y = \frac{1}{60} \cdot (60 y)$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.3.2.3

Cancel the common factor of $y$ .

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Step 5.3.2.3.1

Cancel the common factor.

$\frac{60}{y} \cdot y = \frac{1}{60} \cdot (60 y)$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.3.2.3.2

Rewrite the expression.

$60 = \frac{1}{60} \cdot (60 y)$

$x = \frac{30 y}{y - 30}$

$z = 30$

$60 = \frac{1}{60} \cdot (60 y)$

$x = \frac{30 y}{y - 30}$

$z = 30$

$60 = \frac{1}{60} \cdot (60 y)$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.3.3

Simplify the right side.

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Step 5.3.3.1

Cancel the common factor of $60$ .

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Step 5.3.3.1.1

Factor $60$ out of $60 y$ .

$60 = \frac{1}{60} \cdot (60 (y))$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.3.3.1.2

Cancel the common factor.

$60 = \frac{1}{60} \cdot (60 y)$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.3.3.1.3

Rewrite the expression.

$60 = y$

$x = \frac{30 y}{y - 30}$

$z = 30$

$60 = y$

$x = \frac{30 y}{y - 30}$

$z = 30$

$60 = y$

$x = \frac{30 y}{y - 30}$

$z = 30$

$60 = y$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 5.4

Rewrite the equation as $y = 60$ .

$y = 60$

$x = \frac{30 y}{y - 30}$

$z = 30$

$y = 60$

$x = \frac{30 y}{y - 30}$

$z = 30$

Step 6

Replace all occurrences of $y$ with $60$ in each equation.

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Step 6.1

Replace all occurrences of $y$ in $x = \frac{30 y}{y - 30}$ with $60$ .

$x = \frac{30 (60)}{(60) - 30}$

$y = 60$

$z = 30$

Step 6.2

Simplify the right side.

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Step 6.2.1

Simplify $\frac{30 (60)}{(60) - 30}$ .

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Step 6.2.1.1

Cancel the common factors.

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Step 6.2.1.1.1

Factor $30$ out of $60$ .

$x = \frac{30 (60)}{30 (2) - 30}$

$y = 60$

$z = 30$

Step 6.2.1.1.2

Factor $30$ out of $- 30$ .

$x = \frac{30 (60)}{30 \cdot 2 + 30 \cdot - 1}$

$y = 60$

$z = 30$

Step 6.2.1.1.3

Factor $30$ out of $30 \cdot 2 + 30 \cdot - 1$ .

$x = \frac{30 (60)}{30 \cdot (2 - 1)}$

$y = 60$

$z = 30$

Step 6.2.1.1.4

Cancel the common factor.

$x = \frac{30 \cdot 60}{30 \cdot (2 - 1)}$

$y = 60$

$z = 30$

Step 6.2.1.1.5

Rewrite the expression.

$x = \frac{60}{2 - 1}$

$y = 60$

$z = 30$

$x = \frac{60}{2 - 1}$

$y = 60$

$z = 30$

Step 6.2.1.2

Subtract $1$ from $2$ .

$x = \frac{60}{1}$

$y = 60$

$z = 30$

Step 6.2.1.3

Divide $60$ by $1$ .

$x = 60$

$y = 60$

$z = 30$

$x = 60$

$y = 60$

$z = 30$

$x = 60$

$y = 60$

$z = 30$

$x = 60$

$y = 60$

$z = 30$

Step 7

The solution to the system is the complete set of ordered pairs that are valid solutions.

$(60, 60, 30)$

Step 8

The result can be shown in multiple forms.

Point Form:

$(60, 60, 30)$

Equation Form:

$x = 60, y = 60, z = 30$