Precalculus Examples

$2 x - 5 y + 3 z = 5$ , $- 3 x + 4 y - 3 z = - 6$ , $- 7 y + 3 z = 3$

Step 1

Solve for $x$ in $2 x - 5 y + 3 z = 5$ .

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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

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

$2 x + 3 z = 5 + 5 y$

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

$- 7 y + 3 z = 3$

Step 1.1.2

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

$2 x = 5 + 5 y - 3 z$

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

$- 7 y + 3 z = 3$

$2 x = 5 + 5 y - 3 z$

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

$- 7 y + 3 z = 3$

Step 1.2

Divide each term in $2 x = 5 + 5 y - 3 z$ by $2$ and simplify.

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Step 1.2.1

Divide each term in $2 x = 5 + 5 y - 3 z$ by $2$ .

$\frac{2 x}{2} = \frac{5}{2} + \frac{5 y}{2} + \frac{- 3 z}{2}$

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

$- 7 y + 3 z = 3$

Step 1.2.2

Simplify the left side.

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Step 1.2.2.1

Cancel the common factor of $2$ .

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Step 1.2.2.1.1

Cancel the common factor.

$\frac{2 x}{2} = \frac{5}{2} + \frac{5 y}{2} + \frac{- 3 z}{2}$

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

$- 7 y + 3 z = 3$

Step 1.2.2.1.2

Divide $x$ by $1$ .

$x = \frac{5}{2} + \frac{5 y}{2} + \frac{- 3 z}{2}$

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

$- 7 y + 3 z = 3$

$x = \frac{5}{2} + \frac{5 y}{2} + \frac{- 3 z}{2}$

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

$- 7 y + 3 z = 3$

$x = \frac{5}{2} + \frac{5 y}{2} + \frac{- 3 z}{2}$

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

$- 7 y + 3 z = 3$

Step 1.2.3

Simplify the right side.

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Step 1.2.3.1

Move the negative in front of the fraction.

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

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

$- 7 y + 3 z = 3$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

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

$- 7 y + 3 z = 3$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

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

$- 7 y + 3 z = 3$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

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

$- 7 y + 3 z = 3$

Step 2

Replace all occurrences of $x$ with $\frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$ in each equation.

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Step 2.1

Replace all occurrences of $x$ in $- 3 x + 4 y - 3 z = - 6$ with $\frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$ .

$- 3 (\frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}) + 4 y - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2

Simplify the left side.

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Step 2.2.1

Simplify $- 3 (\frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}) + 4 y - 3 z$ .

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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.

$- 3 (\frac{5}{2}) - 3 \frac{5 y}{2} - 3 (- \frac{3 z}{2}) + 4 y - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.1.2

Simplify.

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Step 2.2.1.1.2.1

Multiply $- 3 (\frac{5}{2})$ .

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Step 2.2.1.1.2.1.1

Combine $- 3$ and $\frac{5}{2}$ .

$\frac{- 3 \cdot 5}{2} - 3 \frac{5 y}{2} - 3 (- \frac{3 z}{2}) + 4 y - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.1.2.1.2

Multiply $- 3$ by $5$ .

$\frac{- 15}{2} - 3 \frac{5 y}{2} - 3 (- \frac{3 z}{2}) + 4 y - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

$\frac{- 15}{2} - 3 \frac{5 y}{2} - 3 (- \frac{3 z}{2}) + 4 y - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.1.2.2

Multiply $- 3 \frac{5 y}{2}$ .

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Step 2.2.1.1.2.2.1

Combine $- 3$ and $\frac{5 y}{2}$ .

$\frac{- 15}{2} + \frac{- 3 (5 y)}{2} - 3 (- \frac{3 z}{2}) + 4 y - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.1.2.2.2

Multiply $5$ by $- 3$ .

$\frac{- 15}{2} + \frac{- 15 y}{2} - 3 (- \frac{3 z}{2}) + 4 y - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

$\frac{- 15}{2} + \frac{- 15 y}{2} - 3 (- \frac{3 z}{2}) + 4 y - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.1.2.3

Multiply $- 3 (- \frac{3 z}{2})$ .

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Step 2.2.1.1.2.3.1

Multiply $- 1$ by $- 3$ .

$\frac{- 15}{2} + \frac{- 15 y}{2} + 3 (\frac{3 z}{2}) + 4 y - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.1.2.3.2

Combine $3$ and $\frac{3 z}{2}$ .

$\frac{- 15}{2} + \frac{- 15 y}{2} + \frac{3 (3 z)}{2} + 4 y - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.1.2.3.3

Multiply $3$ by $3$ .

$\frac{- 15}{2} + \frac{- 15 y}{2} + \frac{9 z}{2} + 4 y - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

$\frac{- 15}{2} + \frac{- 15 y}{2} + \frac{9 z}{2} + 4 y - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

$\frac{- 15}{2} + \frac{- 15 y}{2} + \frac{9 z}{2} + 4 y - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.1.3

Simplify each term.

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Step 2.2.1.1.3.1

Move the negative in front of the fraction.

$- \frac{15}{2} + \frac{- 15 y}{2} + \frac{9 z}{2} + 4 y - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.1.3.2

Move the negative in front of the fraction.

$- \frac{15}{2} - \frac{15 y}{2} + \frac{9 z}{2} + 4 y - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

$- \frac{15}{2} - \frac{15 y}{2} + \frac{9 z}{2} + 4 y - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

$- \frac{15}{2} - \frac{15 y}{2} + \frac{9 z}{2} + 4 y - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.2

To write $4 y$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$- \frac{15}{2} + \frac{9 z}{2} - \frac{15 y}{2} + 4 y \cdot \frac{2}{2} - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.3

Combine $4 y$ and $\frac{2}{2}$ .

$- \frac{15}{2} + \frac{9 z}{2} - \frac{15 y}{2} + \frac{4 y \cdot 2}{2} - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.4

Combine the numerators over the common denominator.

$- \frac{15}{2} + \frac{9 z}{2} + \frac{- 15 y + 4 y \cdot 2}{2} - 3 z = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.5

Combine the numerators over the common denominator.

$- 3 z + \frac{- 15 + 9 z - 15 y + 4 y \cdot 2}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.6

Multiply $2$ by $4$ .

$- 3 z + \frac{- 15 + 9 z - 15 y + 8 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.7

Add $- 15 y$ and $8 y$ .

$- 3 z + \frac{- 15 + 9 z - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.8

To write $- 3 z$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$- 3 z \cdot \frac{2}{2} + \frac{- 15 + 9 z - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.9

Simplify terms.

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Step 2.2.1.9.1

Combine $- 3 z$ and $\frac{2}{2}$ .

$\frac{- 3 z \cdot 2}{2} + \frac{- 15 + 9 z - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.9.2

Combine the numerators over the common denominator.

$\frac{- 3 z \cdot 2 - 15 + 9 z - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

$\frac{- 3 z \cdot 2 - 15 + 9 z - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.10

Simplify the numerator.

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Step 2.2.1.10.1

Multiply $2$ by $- 3$ .

$\frac{- 6 z - 15 + 9 z - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 2.2.1.10.2

Add $- 6 z$ and $9 z$ .

$\frac{3 z - 15 - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

$\frac{3 z - 15 - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

$\frac{3 z - 15 - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

$\frac{3 z - 15 - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

$\frac{3 z - 15 - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 7 y + 3 z = 3$

Step 3

Solve for $y$ in $- 7 y + 3 z = 3$ .

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Step 3.1

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

$- 7 y = 3 - 3 z$

$\frac{3 z - 15 - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 3.2

Divide each term in $- 7 y = 3 - 3 z$ by $- 7$ and simplify.

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Step 3.2.1

Divide each term in $- 7 y = 3 - 3 z$ by $- 7$ .

$\frac{- 7 y}{- 7} = \frac{3}{- 7} + \frac{- 3 z}{- 7}$

$\frac{3 z - 15 - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 3.2.2

Simplify the left side.

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Step 3.2.2.1

Cancel the common factor of $- 7$ .

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Step 3.2.2.1.1

Cancel the common factor.

$\frac{- 7 y}{- 7} = \frac{3}{- 7} + \frac{- 3 z}{- 7}$

$\frac{3 z - 15 - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 3.2.2.1.2

Divide $y$ by $1$ .

$y = \frac{3}{- 7} + \frac{- 3 z}{- 7}$

$\frac{3 z - 15 - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$y = \frac{3}{- 7} + \frac{- 3 z}{- 7}$

$\frac{3 z - 15 - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$y = \frac{3}{- 7} + \frac{- 3 z}{- 7}$

$\frac{3 z - 15 - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

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

Move the negative in front of the fraction.

$y = - \frac{3}{7} + \frac{- 3 z}{- 7}$

$\frac{3 z - 15 - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 3.2.3.1.2

Dividing two negative values results in a positive value.

$y = - \frac{3}{7} + \frac{3 z}{7}$

$\frac{3 z - 15 - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$\frac{3 z - 15 - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$\frac{3 z - 15 - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$\frac{3 z - 15 - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$\frac{3 z - 15 - 7 y}{2} = - 6$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 4

Replace all occurrences of $y$ with $- \frac{3}{7} + \frac{3 z}{7}$ in each equation.

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Step 4.1

Replace all occurrences of $y$ in $\frac{3 z - 15 - 7 y}{2} = - 6$ with $- \frac{3}{7} + \frac{3 z}{7}$ .

$\frac{3 z - 15 - 7 (- \frac{3}{7} + \frac{3 z}{7})}{2} = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 4.2

Simplify the left side.

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Step 4.2.1

Simplify $\frac{3 z - 15 - 7 (- \frac{3}{7} + \frac{3 z}{7})}{2}$ .

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Step 4.2.1.1

Simplify the numerator.

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Step 4.2.1.1.1

Apply the distributive property.

$\frac{3 z - 15 - 7 (- \frac{3}{7}) - 7 \frac{3 z}{7}}{2} = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 4.2.1.1.2

Cancel the common factor of $7$ .

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Step 4.2.1.1.2.1

Move the leading negative in $- \frac{3}{7}$ into the numerator.

$\frac{3 z - 15 - 7 (\frac{- 3}{7}) - 7 \frac{3 z}{7}}{2} = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 4.2.1.1.2.2

Factor $7$ out of $- 7$ .

$\frac{3 z - 15 + 7 (- 1) (\frac{- 3}{7}) - 7 \frac{3 z}{7}}{2} = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 4.2.1.1.2.3

Cancel the common factor.

$\frac{3 z - 15 + 7 \cdot (- 1 (\frac{- 3}{7})) - 7 \frac{3 z}{7}}{2} = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 4.2.1.1.2.4

Rewrite the expression.

$\frac{3 z - 15 - 1 \cdot - 3 - 7 \frac{3 z}{7}}{2} = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$\frac{3 z - 15 - 1 \cdot - 3 - 7 \frac{3 z}{7}}{2} = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 4.2.1.1.3

Multiply $- 1$ by $- 3$ .

$\frac{3 z - 15 + 3 - 7 \frac{3 z}{7}}{2} = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 4.2.1.1.4

Cancel the common factor of $7$ .

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Step 4.2.1.1.4.1

Factor $7$ out of $- 7$ .

$\frac{3 z - 15 + 3 + 7 (- 1) (\frac{3 z}{7})}{2} = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 4.2.1.1.4.2

Cancel the common factor.

$\frac{3 z - 15 + 3 + 7 \cdot (- 1 \frac{3 z}{7})}{2} = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 4.2.1.1.4.3

Rewrite the expression.

$\frac{3 z - 15 + 3 - 1 (3 z)}{2} = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$\frac{3 z - 15 + 3 - 1 (3 z)}{2} = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 4.2.1.1.5

Multiply $3$ by $- 1$ .

$\frac{3 z - 15 + 3 - 3 z}{2} = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 4.2.1.1.6

Subtract $3 z$ from $3 z$ .

$\frac{0 - 15 + 3}{2} = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 4.2.1.1.7

Subtract $15$ from $0$ .

$\frac{- 15 + 3}{2} = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 4.2.1.1.8

Add $- 15$ and $3$ .

$\frac{- 12}{2} = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$\frac{- 12}{2} = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 4.2.1.2

Divide $- 12$ by $2$ .

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$

Step 4.3

Replace all occurrences of $y$ in $x = \frac{5}{2} + \frac{5 y}{2} - \frac{3 z}{2}$ with $- \frac{3}{7} + \frac{3 z}{7}$ .

$x = \frac{5}{2} + \frac{5 (- \frac{3}{7} + \frac{3 z}{7})}{2} - \frac{3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4

Simplify the right side.

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Step 4.4.1

Simplify $\frac{5}{2} + \frac{5 (- \frac{3}{7} + \frac{3 z}{7})}{2} - \frac{3 z}{2}$ .

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Step 4.4.1.1

Combine the numerators over the common denominator.

$x = \frac{5 + 5 (- \frac{3}{7} + \frac{3 z}{7}) - 3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.2

Simplify each term.

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Step 4.4.1.2.1

Apply the distributive property.

$x = \frac{5 + 5 (- \frac{3}{7}) + 5 (\frac{3 z}{7}) - 3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.2.2

Multiply $5 (- \frac{3}{7})$ .

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Step 4.4.1.2.2.1

Multiply $- 1$ by $5$ .

$x = \frac{5 - 5 (\frac{3}{7}) + 5 (\frac{3 z}{7}) - 3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.2.2.2

Combine $- 5$ and $\frac{3}{7}$ .

$x = \frac{5 + \frac{- 5 \cdot 3}{7} + 5 (\frac{3 z}{7}) - 3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.2.2.3

Multiply $- 5$ by $3$ .

$x = \frac{5 + \frac{- 15}{7} + 5 (\frac{3 z}{7}) - 3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5 + \frac{- 15}{7} + 5 (\frac{3 z}{7}) - 3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.2.3

Multiply $5 \frac{3 z}{7}$ .

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Step 4.4.1.2.3.1

Combine $5$ and $\frac{3 z}{7}$ .

$x = \frac{5 + \frac{- 15}{7} + \frac{5 (3 z)}{7} - 3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.2.3.2

Multiply $3$ by $5$ .

$x = \frac{5 + \frac{- 15}{7} + \frac{15 z}{7} - 3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5 + \frac{- 15}{7} + \frac{15 z}{7} - 3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.2.4

Move the negative in front of the fraction.

$x = \frac{5 - \frac{15}{7} + \frac{15 z}{7} - 3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{5 - \frac{15}{7} + \frac{15 z}{7} - 3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.3

To write $5$ as a fraction with a common denominator, multiply by $\frac{7}{7}$ .

$x = \frac{5 \cdot \frac{7}{7} - \frac{15}{7} + \frac{15 z}{7} - 3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.4

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

$x = \frac{\frac{5 \cdot 7}{7} - \frac{15}{7} + \frac{15 z}{7} - 3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.5

Combine the numerators over the common denominator.

$x = \frac{\frac{5 \cdot 7 - 15}{7} + \frac{15 z}{7} - 3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.6

Simplify the numerator.

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Step 4.4.1.6.1

Multiply $5$ by $7$ .

$x = \frac{\frac{35 - 15}{7} + \frac{15 z}{7} - 3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.6.2

Subtract $15$ from $35$ .

$x = \frac{\frac{20}{7} + \frac{15 z}{7} - 3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{\frac{20}{7} + \frac{15 z}{7} - 3 z}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.7

To write $- 3 z$ as a fraction with a common denominator, multiply by $\frac{7}{7}$ .

$x = \frac{\frac{20}{7} + \frac{15 z}{7} - 3 z \cdot \frac{7}{7}}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.8

Combine $- 3 z$ and $\frac{7}{7}$ .

$x = \frac{\frac{20}{7} + \frac{15 z}{7} + \frac{- 3 z \cdot 7}{7}}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.9

Combine the numerators over the common denominator.

$x = \frac{\frac{20}{7} + \frac{15 z - 3 z \cdot 7}{7}}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.10

Combine the numerators over the common denominator.

$x = \frac{\frac{20 + 15 z - 3 z \cdot 7}{7}}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.11

Multiply $7$ by $- 3$ .

$x = \frac{\frac{20 + 15 z - 21 z}{7}}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.12

Subtract $21 z$ from $15 z$ .

$x = \frac{\frac{20 - 6 z}{7}}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.13

Factor $2$ out of $20 - 6 z$ .

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Step 4.4.1.13.1

Factor $2$ out of $20$ .

$x = \frac{\frac{2 (10) - 6 z}{7}}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.13.2

Factor $2$ out of $- 6 z$ .

$x = \frac{\frac{2 (10) + 2 (- 3 z)}{7}}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.13.3

Factor $2$ out of $2 (10) + 2 (- 3 z)$ .

$x = \frac{\frac{2 (10 - 3 z)}{7}}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{\frac{2 (10 - 3 z)}{7}}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.14

Multiply the numerator by the reciprocal of the denominator.

$x = \frac{2 (10 - 3 z)}{7} \cdot \frac{1}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.15

Cancel the common factor of $2$ .

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Step 4.4.1.15.1

Cancel the common factor.

$x = \frac{2 (10 - 3 z)}{7} \cdot \frac{1}{2}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 4.4.1.15.2

Rewrite the expression.

$x = \frac{10 - 3 z}{7}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{10 - 3 z}{7}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{10 - 3 z}{7}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{10 - 3 z}{7}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

$x = \frac{10 - 3 z}{7}$

$- 6 = - 6$

$y = - \frac{3}{7} + \frac{3 z}{7}$

Step 5

Remove any equations from the system that are always true.

$x = \frac{10 - 3 z}{7}$

$y = - \frac{3}{7} + \frac{3 z}{7}$