Finite Math Examples

$x + 2 y + 3 z = 15$ , $2 x + 3 y + 4 = - 3$ , $- x - 4 y - 8 z = - 70$

Step 1

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

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Step 1.1

Subtract $2 y$ from both sides of the equation.

$x + 3 z = 15 - 2 y$

$2 x + 3 y + 4 = - 3$

$- x - 4 y - 8 z = - 70$

Step 1.2

Subtract $3 z$ from both sides of the equation.

$x = 15 - 2 y - 3 z$

$2 x + 3 y + 4 = - 3$

$- x - 4 y - 8 z = - 70$

$x = 15 - 2 y - 3 z$

$2 x + 3 y + 4 = - 3$

$- x - 4 y - 8 z = - 70$

Step 2

Replace all occurrences of $x$ with $15 - 2 y - 3 z$ in each equation.

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Step 2.1

Replace all occurrences of $x$ in $2 x + 3 y + 4 = - 3$ with $15 - 2 y - 3 z$ .

$2 (15 - 2 y - 3 z) + 3 y + 4 = - 3$

$x = 15 - 2 y - 3 z$

$- x - 4 y - 8 z = - 70$

Step 2.2

Simplify the left side.

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Step 2.2.1

Simplify $2 (15 - 2 y - 3 z) + 3 y + 4$ .

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Step 2.2.1.1

Simplify each term.

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Step 2.2.1.1.1

Apply the distributive property.

$2 \cdot 15 + 2 (- 2 y) + 2 (- 3 z) + 3 y + 4 = - 3$

$x = 15 - 2 y - 3 z$

$- x - 4 y - 8 z = - 70$

Step 2.2.1.1.2

Simplify.

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Step 2.2.1.1.2.1

Multiply $2$ by $15$ .

$30 + 2 (- 2 y) + 2 (- 3 z) + 3 y + 4 = - 3$

$x = 15 - 2 y - 3 z$

$- x - 4 y - 8 z = - 70$

Step 2.2.1.1.2.2

Multiply $- 2$ by $2$ .

$30 - 4 y + 2 (- 3 z) + 3 y + 4 = - 3$

$x = 15 - 2 y - 3 z$

$- x - 4 y - 8 z = - 70$

Step 2.2.1.1.2.3

Multiply $- 3$ by $2$ .

$30 - 4 y - 6 z + 3 y + 4 = - 3$

$x = 15 - 2 y - 3 z$

$- x - 4 y - 8 z = - 70$

$30 - 4 y - 6 z + 3 y + 4 = - 3$

$x = 15 - 2 y - 3 z$

$- x - 4 y - 8 z = - 70$

$30 - 4 y - 6 z + 3 y + 4 = - 3$

$x = 15 - 2 y - 3 z$

$- x - 4 y - 8 z = - 70$

Step 2.2.1.2

Simplify by adding terms.

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Step 2.2.1.2.1

Add $30$ and $4$ .

$- 4 y - 6 z + 3 y + 34 = - 3$

$x = 15 - 2 y - 3 z$

$- x - 4 y - 8 z = - 70$

Step 2.2.1.2.2

Add $- 4 y$ and $3 y$ .

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

$- x - 4 y - 8 z = - 70$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

$- x - 4 y - 8 z = - 70$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

$- x - 4 y - 8 z = - 70$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

$- x - 4 y - 8 z = - 70$

Step 2.3

Replace all occurrences of $x$ in $- x - 4 y - 8 z = - 70$ with $15 - 2 y - 3 z$ .

$- (15 - 2 y - 3 z) - 4 y - 8 z = - 70$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

Step 2.4

Simplify the left side.

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Step 2.4.1

Simplify $- (15 - 2 y - 3 z) - 4 y - 8 z$ .

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Step 2.4.1.1

Simplify each term.

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Step 2.4.1.1.1

Apply the distributive property.

$- 1 \cdot 15 - (- 2 y) - (- 3 z) - 4 y - 8 z = - 70$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

Step 2.4.1.1.2

Simplify.

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Step 2.4.1.1.2.1

Multiply $- 1$ by $15$ .

$- 15 - (- 2 y) - (- 3 z) - 4 y - 8 z = - 70$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

Step 2.4.1.1.2.2

Multiply $- 2$ by $- 1$ .

$- 15 + 2 y - (- 3 z) - 4 y - 8 z = - 70$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

Step 2.4.1.1.2.3

Multiply $- 3$ by $- 1$ .

$- 15 + 2 y + 3 z - 4 y - 8 z = - 70$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

$- 15 + 2 y + 3 z - 4 y - 8 z = - 70$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

$- 15 + 2 y + 3 z - 4 y - 8 z = - 70$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

Step 2.4.1.2

Simplify by adding terms.

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Step 2.4.1.2.1

Subtract $4 y$ from $2 y$ .

$- 15 - 2 y + 3 z - 8 z = - 70$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

Step 2.4.1.2.2

Subtract $8 z$ from $3 z$ .

$- 15 - 2 y - 5 z = - 70$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

$- 15 - 2 y - 5 z = - 70$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

$- 15 - 2 y - 5 z = - 70$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

$- 15 - 2 y - 5 z = - 70$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

$- 15 - 2 y - 5 z = - 70$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

Step 3

Solve for $y$ in $- 15 - 2 y - 5 z = - 70$ .

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Step 3.1

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

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Step 3.1.1

Add $15$ to both sides of the equation.

$- 2 y - 5 z = - 70 + 15$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

Step 3.1.2

Add $5 z$ to both sides of the equation.

$- 2 y = - 70 + 15 + 5 z$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

Step 3.1.3

Add $- 70$ and $15$ .

$- 2 y = - 55 + 5 z$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

$- 2 y = - 55 + 5 z$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

Step 3.2

Divide each term in $- 2 y = - 55 + 5 z$ by $- 2$ and simplify.

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Step 3.2.1

Divide each term in $- 2 y = - 55 + 5 z$ by $- 2$ .

$\frac{- 2 y}{- 2} = \frac{- 55}{- 2} + \frac{5 z}{- 2}$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

Step 3.2.2

Simplify the left side.

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Step 3.2.2.1

Cancel the common factor of $- 2$ .

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Step 3.2.2.1.1

Cancel the common factor.

$\frac{- 2 y}{- 2} = \frac{- 55}{- 2} + \frac{5 z}{- 2}$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

Step 3.2.2.1.2

Divide $y$ by $1$ .

$y = \frac{- 55}{- 2} + \frac{5 z}{- 2}$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

$y = \frac{- 55}{- 2} + \frac{5 z}{- 2}$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

$y = \frac{- 55}{- 2} + \frac{5 z}{- 2}$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

Step 3.2.3

Simplify the right side.

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Step 3.2.3.1

Simplify each term.

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Step 3.2.3.1.1

Dividing two negative values results in a positive value.

$y = \frac{55}{2} + \frac{5 z}{- 2}$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

Step 3.2.3.1.2

Move the negative in front of the fraction.

$y = \frac{55}{2} - \frac{5 z}{2}$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

$- y - 6 z + 34 = - 3$

$x = 15 - 2 y - 3 z$

Step 4

Replace all occurrences of $y$ with $\frac{55}{2} - \frac{5 z}{2}$ in each equation.

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Step 4.1

Replace all occurrences of $y$ in $- y - 6 z + 34 = - 3$ with $\frac{55}{2} - \frac{5 z}{2}$ .

$- (\frac{55}{2} - \frac{5 z}{2}) - 6 z + 34 = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2

Simplify the left side.

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Step 4.2.1

Simplify $- (\frac{55}{2} - \frac{5 z}{2}) - 6 z + 34$ .

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Step 4.2.1.1

Simplify each term.

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Step 4.2.1.1.1

Apply the distributive property.

$- \frac{55}{2} + \frac{5 z}{2} - 6 z + 34 = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2.1.1.2

Multiply $- - \frac{5 z}{2}$ .

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Step 4.2.1.1.2.1

Multiply $- 1$ by $- 1$ .

$- \frac{55}{2} + 1 (\frac{5 z}{2}) - 6 z + 34 = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2.1.1.2.2

Multiply $\frac{5 z}{2}$ by $1$ .

$- \frac{55}{2} + \frac{5 z}{2} - 6 z + 34 = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

$- \frac{55}{2} + \frac{5 z}{2} - 6 z + 34 = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

$- \frac{55}{2} + \frac{5 z}{2} - 6 z + 34 = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2.1.2

To write $34$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$\frac{5 z}{2} - 6 z - \frac{55}{2} + 34 \cdot \frac{2}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2.1.3

Combine $34$ and $\frac{2}{2}$ .

$\frac{5 z}{2} - 6 z - \frac{55}{2} + \frac{34 \cdot 2}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2.1.4

Combine the numerators over the common denominator.

$\frac{5 z}{2} - 6 z + \frac{- 55 + 34 \cdot 2}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2.1.5

Simplify the numerator.

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Step 4.2.1.5.1

Multiply $34$ by $2$ .

$\frac{5 z}{2} - 6 z + \frac{- 55 + 68}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2.1.5.2

Add $- 55$ and $68$ .

$\frac{5 z}{2} - 6 z + \frac{13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

$\frac{5 z}{2} - 6 z + \frac{13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2.1.6

To write $- 6 z$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$\frac{5 z}{2} - 6 z \cdot \frac{2}{2} + \frac{13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2.1.7

Combine $- 6 z$ and $\frac{2}{2}$ .

$\frac{5 z}{2} + \frac{- 6 z \cdot 2}{2} + \frac{13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2.1.8

Combine the numerators over the common denominator.

$\frac{5 z - 6 z \cdot 2}{2} + \frac{13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2.1.9

Combine the numerators over the common denominator.

$\frac{5 z - 6 z \cdot 2 + 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2.1.10

Multiply $2$ by $- 6$ .

$\frac{5 z - 12 z + 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2.1.11

Subtract $12 z$ from $5 z$ .

$\frac{- 7 z + 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2.1.12

Factor $- 1$ out of $- 7 z$ .

$\frac{- (7 z) + 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2.1.13

Rewrite $13$ as $- 1 (- 13)$ .

$\frac{- (7 z) - 1 \cdot - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2.1.14

Factor $- 1$ out of $- (7 z) - 1 (- 13)$ .

$\frac{- (7 z - 13)}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2.1.15

Simplify the expression.

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Step 4.2.1.15.1

Rewrite $- (7 z - 13)$ as $- 1 (7 z - 13)$ .

$\frac{- 1 (7 z - 13)}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.2.1.15.2

Move the negative in front of the fraction.

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 2 y - 3 z$

Step 4.3

Replace all occurrences of $y$ in $x = 15 - 2 y - 3 z$ with $\frac{55}{2} - \frac{5 z}{2}$ .

$x = 15 - 2 (\frac{55}{2} - \frac{5 z}{2}) - 3 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 4.4

Simplify the right side.

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Step 4.4.1

Simplify $15 - 2 (\frac{55}{2} - \frac{5 z}{2}) - 3 z$ .

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Step 4.4.1.1

Simplify each term.

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Step 4.4.1.1.1

Apply the distributive property.

$x = 15 - 2 (\frac{55}{2}) - 2 (- \frac{5 z}{2}) - 3 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 4.4.1.1.2

Cancel the common factor of $2$ .

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Step 4.4.1.1.2.1

Factor $2$ out of $- 2$ .

$x = 15 + 2 (- 1) (\frac{55}{2}) - 2 (- \frac{5 z}{2}) - 3 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 4.4.1.1.2.2

Cancel the common factor.

$x = 15 + 2 \cdot (- 1 (\frac{55}{2})) - 2 (- \frac{5 z}{2}) - 3 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 4.4.1.1.2.3

Rewrite the expression.

$x = 15 - 1 \cdot 55 - 2 (- \frac{5 z}{2}) - 3 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 1 \cdot 55 - 2 (- \frac{5 z}{2}) - 3 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 4.4.1.1.3

Multiply $- 1$ by $55$ .

$x = 15 - 55 - 2 (- \frac{5 z}{2}) - 3 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 4.4.1.1.4

Cancel the common factor of $2$ .

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Step 4.4.1.1.4.1

Move the leading negative in $- \frac{5 z}{2}$ into the numerator.

$x = 15 - 55 - 2 \frac{- 5 z}{2} - 3 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 4.4.1.1.4.2

Factor $2$ out of $- 2$ .

$x = 15 - 55 + 2 (- 1) (\frac{- 5 z}{2}) - 3 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 4.4.1.1.4.3

Cancel the common factor.

$x = 15 - 55 + 2 \cdot (- 1 \frac{- 5 z}{2}) - 3 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 4.4.1.1.4.4

Rewrite the expression.

$x = 15 - 55 - 1 (- 5 z) - 3 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 55 - 1 (- 5 z) - 3 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 4.4.1.1.5

Multiply $- 5$ by $- 1$ .

$x = 15 - 55 + 5 z - 3 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = 15 - 55 + 5 z - 3 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 4.4.1.2

Simplify by adding terms.

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Step 4.4.1.2.1

Subtract $55$ from $15$ .

$x = - 40 + 5 z - 3 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 4.4.1.2.2

Subtract $3 z$ from $5 z$ .

$x = - 40 + 2 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = - 40 + 2 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = - 40 + 2 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = - 40 + 2 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = - 40 + 2 z$

$- \frac{7 z - 13}{2} = - 3$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 5

Solve for $z$ in $- \frac{7 z - 13}{2} = - 3$ .

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Step 5.1

Multiply both sides of the equation by $- 2$ .

$- 2 (- \frac{7 z - 13}{2}) = - 2 \cdot - 3$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 5.2

Simplify both sides of the equation.

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Step 5.2.1

Simplify the left side.

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Step 5.2.1.1

Simplify $- 2 (- \frac{7 z - 13}{2})$ .

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Step 5.2.1.1.1

Cancel the common factor of $2$ .

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Step 5.2.1.1.1.1

Move the leading negative in $- \frac{7 z - 13}{2}$ into the numerator.

$- 2 \frac{- (7 z - 13)}{2} = - 2 \cdot - 3$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 5.2.1.1.1.2

Factor $2$ out of $- 2$ .

$2 (- 1) (\frac{- (7 z - 13)}{2}) = - 2 \cdot - 3$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 5.2.1.1.1.3

Cancel the common factor.

$2 \cdot (- 1 \frac{- (7 z - 13)}{2}) = - 2 \cdot - 3$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 5.2.1.1.1.4

Rewrite the expression.

$7 z - 13 = - 2 \cdot - 3$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

$7 z - 13 = - 2 \cdot - 3$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 5.2.1.1.2

Multiply.

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Step 5.2.1.1.2.1

Multiply $- 1$ by $- 1$ .

$1 (7 z - 13) = - 2 \cdot - 3$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 5.2.1.1.2.2

Multiply $7 z - 13$ by $1$ .

$7 z - 13 = - 2 \cdot - 3$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

$7 z - 13 = - 2 \cdot - 3$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

$7 z - 13 = - 2 \cdot - 3$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

$7 z - 13 = - 2 \cdot - 3$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 5.2.2

Simplify the right side.

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Step 5.2.2.1

Multiply $- 2$ by $- 3$ .

$7 z - 13 = 6$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

$7 z - 13 = 6$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

$7 z - 13 = 6$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 5.3

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

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Step 5.3.1

Add $13$ to both sides of the equation.

$7 z = 6 + 13$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 5.3.2

Add $6$ and $13$ .

$7 z = 19$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

$7 z = 19$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 5.4

Divide each term in $7 z = 19$ by $7$ and simplify.

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Step 5.4.1

Divide each term in $7 z = 19$ by $7$ .

$\frac{7 z}{7} = \frac{19}{7}$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 5.4.2

Simplify the left side.

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Step 5.4.2.1

Cancel the common factor of $7$ .

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Step 5.4.2.1.1

Cancel the common factor.

$\frac{7 z}{7} = \frac{19}{7}$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 5.4.2.1.2

Divide $z$ by $1$ .

$z = \frac{19}{7}$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

$z = \frac{19}{7}$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

$z = \frac{19}{7}$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

$z = \frac{19}{7}$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

$z = \frac{19}{7}$

$x = - 40 + 2 z$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 6

Replace all occurrences of $z$ with $\frac{19}{7}$ in each equation.

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Step 6.1

Replace all occurrences of $z$ in $x = - 40 + 2 z$ with $\frac{19}{7}$ .

$x = - 40 + 2 (\frac{19}{7})$

$z = \frac{19}{7}$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 6.2

Simplify the right side.

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Step 6.2.1

Simplify $- 40 + 2 (\frac{19}{7})$ .

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Step 6.2.1.1

Multiply $2 (\frac{19}{7})$ .

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Step 6.2.1.1.1

Combine $2$ and $\frac{19}{7}$ .

$x = - 40 + \frac{2 \cdot 19}{7}$

$z = \frac{19}{7}$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 6.2.1.1.2

Multiply $2$ by $19$ .

$x = - 40 + \frac{38}{7}$

$z = \frac{19}{7}$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = - 40 + \frac{38}{7}$

$z = \frac{19}{7}$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 6.2.1.2

To write $- 40$ as a fraction with a common denominator, multiply by $\frac{7}{7}$ .

$x = - 40 \cdot \frac{7}{7} + \frac{38}{7}$

$z = \frac{19}{7}$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 6.2.1.3

Combine $- 40$ and $\frac{7}{7}$ .

$x = \frac{- 40 \cdot 7}{7} + \frac{38}{7}$

$z = \frac{19}{7}$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 6.2.1.4

Combine the numerators over the common denominator.

$x = \frac{- 40 \cdot 7 + 38}{7}$

$z = \frac{19}{7}$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 6.2.1.5

Simplify the numerator.

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Step 6.2.1.5.1

Multiply $- 40$ by $7$ .

$x = \frac{- 280 + 38}{7}$

$z = \frac{19}{7}$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 6.2.1.5.2

Add $- 280$ and $38$ .

$x = \frac{- 242}{7}$

$z = \frac{19}{7}$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = \frac{- 242}{7}$

$z = \frac{19}{7}$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 6.2.1.6

Move the negative in front of the fraction.

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

$y = \frac{55}{2} - \frac{5 z}{2}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

$y = \frac{55}{2} - \frac{5 z}{2}$

Step 6.3

Replace all occurrences of $z$ in $y = \frac{55}{2} - \frac{5 z}{2}$ with $\frac{19}{7}$ .

$y = \frac{55}{2} - \frac{5 (\frac{19}{7})}{2}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

Step 6.4

Simplify the right side.

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Step 6.4.1

Simplify $\frac{55}{2} - \frac{5 (\frac{19}{7})}{2}$ .

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Step 6.4.1.1

Combine the numerators over the common denominator.

$y = \frac{55 - 5 (\frac{19}{7})}{2}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

Step 6.4.1.2

Simplify each term.

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Step 6.4.1.2.1

Multiply $- 5 (\frac{19}{7})$ .

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Step 6.4.1.2.1.1

Combine $- 5$ and $\frac{19}{7}$ .

$y = \frac{55 + \frac{- 5 \cdot 19}{7}}{2}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

Step 6.4.1.2.1.2

Multiply $- 5$ by $19$ .

$y = \frac{55 + \frac{- 95}{7}}{2}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

$y = \frac{55 + \frac{- 95}{7}}{2}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

Step 6.4.1.2.2

Move the negative in front of the fraction.

$y = \frac{55 - \frac{95}{7}}{2}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

$y = \frac{55 - \frac{95}{7}}{2}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

Step 6.4.1.3

To write $55$ as a fraction with a common denominator, multiply by $\frac{7}{7}$ .

$y = \frac{55 \cdot \frac{7}{7} - \frac{95}{7}}{2}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

Step 6.4.1.4

Combine $55$ and $\frac{7}{7}$ .

$y = \frac{\frac{55 \cdot 7}{7} - \frac{95}{7}}{2}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

Step 6.4.1.5

Combine the numerators over the common denominator.

$y = \frac{\frac{55 \cdot 7 - 95}{7}}{2}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

Step 6.4.1.6

Simplify the numerator.

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Step 6.4.1.6.1

Multiply $55$ by $7$ .

$y = \frac{\frac{385 - 95}{7}}{2}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

Step 6.4.1.6.2

Subtract $95$ from $385$ .

$y = \frac{\frac{290}{7}}{2}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

$y = \frac{\frac{290}{7}}{2}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

Step 6.4.1.7

Multiply the numerator by the reciprocal of the denominator.

$y = \frac{290}{7} \cdot \frac{1}{2}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

Step 6.4.1.8

Cancel the common factor of $2$ .

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Step 6.4.1.8.1

Factor $2$ out of $290$ .

$y = \frac{2 (145)}{7} \cdot \frac{1}{2}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

Step 6.4.1.8.2

Cancel the common factor.

$y = \frac{2 \cdot 145}{7} \cdot \frac{1}{2}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

Step 6.4.1.8.3

Rewrite the expression.

$y = \frac{145}{7}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

$y = \frac{145}{7}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

$y = \frac{145}{7}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

$y = \frac{145}{7}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

$y = \frac{145}{7}$

$x = - \frac{242}{7}$

$z = \frac{19}{7}$

Step 7

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

$(- \frac{242}{7}, \frac{145}{7}, \frac{19}{7})$

Step 8

The result can be shown in multiple forms.

Point Form:

$(- \frac{242}{7}, \frac{145}{7}, \frac{19}{7})$

Equation Form:

$x = - \frac{242}{7}, y = \frac{145}{7}, z = \frac{19}{7}$