Algebra Examples

$3 x + 3 y - 6 z = 9$ $- 4 x + y + 3 z = 8$ $- 2 x + y + 2 z = 2$

Step 1

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

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Step 1.1

Add $4 x$ to both sides of the equation.

$y + 3 z = 8 + 4 x$

$3 x + 3 y - 6 z = 9$

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

Step 1.2

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

$y = 8 + 4 x - 3 z$

$3 x + 3 y - 6 z = 9$

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

$y = 8 + 4 x - 3 z$

$3 x + 3 y - 6 z = 9$

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

Step 2

Replace all occurrences of $y$ with $8 + 4 x - 3 z$ in each equation.

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Step 2.1

Replace all occurrences of $y$ in $3 x + 3 y - 6 z = 9$ with $8 + 4 x - 3 z$ .

$3 x + 3 (8 + 4 x - 3 z) - 6 z = 9$

$y = 8 + 4 x - 3 z$

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

Step 2.2

Simplify the left side.

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Step 2.2.1

Simplify $3 x + 3 (8 + 4 x - 3 z) - 6 z$ .

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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.

$3 x + 3 \cdot 8 + 3 (4 x) + 3 (- 3 z) - 6 z = 9$

$y = 8 + 4 x - 3 z$

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

Step 2.2.1.1.2

Simplify.

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Step 2.2.1.1.2.1

Multiply $3$ by $8$ .

$3 x + 24 + 3 (4 x) + 3 (- 3 z) - 6 z = 9$

$y = 8 + 4 x - 3 z$

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

Step 2.2.1.1.2.2

Multiply $4$ by $3$ .

$3 x + 24 + 12 x + 3 (- 3 z) - 6 z = 9$

$y = 8 + 4 x - 3 z$

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

Step 2.2.1.1.2.3

Multiply $- 3$ by $3$ .

$3 x + 24 + 12 x - 9 z - 6 z = 9$

$y = 8 + 4 x - 3 z$

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

$3 x + 24 + 12 x - 9 z - 6 z = 9$

$y = 8 + 4 x - 3 z$

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

$3 x + 24 + 12 x - 9 z - 6 z = 9$

$y = 8 + 4 x - 3 z$

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

Step 2.2.1.2

Simplify by adding terms.

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Step 2.2.1.2.1

Add $3 x$ and $12 x$ .

$15 x + 24 - 9 z - 6 z = 9$

$y = 8 + 4 x - 3 z$

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

Step 2.2.1.2.2

Subtract $6 z$ from $- 9 z$ .

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

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

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

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

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

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

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

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

Step 2.3

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

$- 2 x + 8 + 4 x - 3 z + 2 z = 2$

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

Step 2.4

Simplify the left side.

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Step 2.4.1

Simplify $- 2 x + 8 + 4 x - 3 z + 2 z$ .

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Step 2.4.1.1

Remove parentheses.

$- 2 x + 8 + 4 x - 3 z + 2 z = 2$

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

Step 2.4.1.2

Add $- 2 x$ and $4 x$ .

$2 x + 8 - 3 z + 2 z = 2$

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

Step 2.4.1.3

Add $- 3 z$ and $2 z$ .

$2 x + 8 - z = 2$

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

$2 x + 8 - z = 2$

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

$2 x + 8 - z = 2$

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

$2 x + 8 - z = 2$

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

Step 3

Solve for $x$ in $2 x + 8 - z = 2$ .

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Step 3.1

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

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Step 3.1.1

Subtract $8$ from both sides of the equation.

$2 x - z = 2 - 8$

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

Step 3.1.2

Add $z$ to both sides of the equation.

$2 x = 2 - 8 + z$

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

Step 3.1.3

Subtract $8$ from $2$ .

$2 x = - 6 + z$

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

$2 x = - 6 + z$

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

Step 3.2

Divide each term in $2 x = - 6 + z$ by $2$ and simplify.

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Step 3.2.1

Divide each term in $2 x = - 6 + z$ by $2$ .

$\frac{2 x}{2} = \frac{- 6}{2} + \frac{z}{2}$

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

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.

$\frac{2 x}{2} = \frac{- 6}{2} + \frac{z}{2}$

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

Step 3.2.2.1.2

Divide $x$ by $1$ .

$x = \frac{- 6}{2} + \frac{z}{2}$

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

$x = \frac{- 6}{2} + \frac{z}{2}$

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

$x = \frac{- 6}{2} + \frac{z}{2}$

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

Step 3.2.3

Simplify the right side.

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Step 3.2.3.1

Divide $- 6$ by $2$ .

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

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

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

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

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

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

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

$15 x + 24 - 15 z = 9$

$y = 8 + 4 x - 3 z$

Step 4

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

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Step 4.1

Replace all occurrences of $x$ in $15 x + 24 - 15 z = 9$ with $- 3 + \frac{z}{2}$ .

$15 (- 3 + \frac{z}{2}) + 24 - 15 z = 9$

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

$y = 8 + 4 x - 3 z$

Step 4.2

Simplify the left side.

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Step 4.2.1

Simplify $15 (- 3 + \frac{z}{2}) + 24 - 15 z$ .

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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.

$15 \cdot - 3 + 15 (\frac{z}{2}) + 24 - 15 z = 9$

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

$y = 8 + 4 x - 3 z$

Step 4.2.1.1.2

Multiply $15$ by $- 3$ .

$- 45 + 15 (\frac{z}{2}) + 24 - 15 z = 9$

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

$y = 8 + 4 x - 3 z$

Step 4.2.1.1.3

Combine $15$ and $\frac{z}{2}$ .

$- 45 + \frac{15 z}{2} + 24 - 15 z = 9$

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

$y = 8 + 4 x - 3 z$

$- 45 + \frac{15 z}{2} + 24 - 15 z = 9$

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

$y = 8 + 4 x - 3 z$

Step 4.2.1.2

Add $- 45$ and $24$ .

$\frac{15 z}{2} - 21 - 15 z = 9$

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

$y = 8 + 4 x - 3 z$

Step 4.2.1.3

To write $- 15 z$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$\frac{15 z}{2} - 15 z \cdot \frac{2}{2} - 21 = 9$

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

$y = 8 + 4 x - 3 z$

Step 4.2.1.4

Simplify terms.

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Step 4.2.1.4.1

Combine $- 15 z$ and $\frac{2}{2}$ .

$\frac{15 z}{2} + \frac{- 15 z \cdot 2}{2} - 21 = 9$

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

$y = 8 + 4 x - 3 z$

Step 4.2.1.4.2

Combine the numerators over the common denominator.

$\frac{15 z - 15 z \cdot 2}{2} - 21 = 9$

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

$y = 8 + 4 x - 3 z$

$\frac{15 z - 15 z \cdot 2}{2} - 21 = 9$

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

$y = 8 + 4 x - 3 z$

Step 4.2.1.5

Simplify each term.

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Step 4.2.1.5.1

Simplify the numerator.

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Step 4.2.1.5.1.1

Factor $15 z$ out of $15 z - 15 z \cdot 2$ .

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Step 4.2.1.5.1.1.1

Factor $15 z$ out of $15 z$ .

$\frac{15 z (1) - 15 z \cdot 2}{2} - 21 = 9$

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

$y = 8 + 4 x - 3 z$

Step 4.2.1.5.1.1.2

Factor $15 z$ out of $- 15 z \cdot 2$ .

$\frac{15 z (1) + 15 z (- 1 \cdot 2)}{2} - 21 = 9$

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

$y = 8 + 4 x - 3 z$

Step 4.2.1.5.1.1.3

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

$\frac{15 z (1 - 1 \cdot 2)}{2} - 21 = 9$

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

$y = 8 + 4 x - 3 z$

$\frac{15 z (1 - 1 \cdot 2)}{2} - 21 = 9$

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

$y = 8 + 4 x - 3 z$

Step 4.2.1.5.1.2

Multiply $- 1$ by $2$ .

$\frac{15 z (1 - 2)}{2} - 21 = 9$

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

$y = 8 + 4 x - 3 z$

Step 4.2.1.5.1.3

Subtract $2$ from $1$ .

$\frac{15 z \cdot - 1}{2} - 21 = 9$

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

$y = 8 + 4 x - 3 z$

Step 4.2.1.5.1.4

Multiply $- 1$ by $15$ .

$\frac{- 15 z}{2} - 21 = 9$

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

$y = 8 + 4 x - 3 z$

$\frac{- 15 z}{2} - 21 = 9$

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

$y = 8 + 4 x - 3 z$

Step 4.2.1.5.2

Move the negative in front of the fraction.

$- \frac{15 z}{2} - 21 = 9$

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

$y = 8 + 4 x - 3 z$

$- \frac{15 z}{2} - 21 = 9$

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

$y = 8 + 4 x - 3 z$

$- \frac{15 z}{2} - 21 = 9$

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

$y = 8 + 4 x - 3 z$

$- \frac{15 z}{2} - 21 = 9$

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

$y = 8 + 4 x - 3 z$

Step 4.3

Replace all occurrences of $x$ in $y = 8 + 4 x - 3 z$ with $- 3 + \frac{z}{2}$ .

$y = 8 + 4 (- 3 + \frac{z}{2}) - 3 z$

$- \frac{15 z}{2} - 21 = 9$

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

Step 4.4

Simplify the right side.

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Step 4.4.1

Simplify $8 + 4 (- 3 + \frac{z}{2}) - 3 z$ .

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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.

$y = 8 + 4 \cdot - 3 + 4 (\frac{z}{2}) - 3 z$

$- \frac{15 z}{2} - 21 = 9$

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

Step 4.4.1.1.2

Multiply $4$ by $- 3$ .

$y = 8 - 12 + 4 (\frac{z}{2}) - 3 z$

$- \frac{15 z}{2} - 21 = 9$

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

Step 4.4.1.1.3

Cancel the common factor of $2$ .

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Step 4.4.1.1.3.1

Factor $2$ out of $4$ .

$y = 8 - 12 + 2 (2) (\frac{z}{2}) - 3 z$

$- \frac{15 z}{2} - 21 = 9$

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

Step 4.4.1.1.3.2

Cancel the common factor.

$y = 8 - 12 + 2 \cdot (2 (\frac{z}{2})) - 3 z$

$- \frac{15 z}{2} - 21 = 9$

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

Step 4.4.1.1.3.3

Rewrite the expression.

$y = 8 - 12 + 2 z - 3 z$

$- \frac{15 z}{2} - 21 = 9$

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

$y = 8 - 12 + 2 z - 3 z$

$- \frac{15 z}{2} - 21 = 9$

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

$y = 8 - 12 + 2 z - 3 z$

$- \frac{15 z}{2} - 21 = 9$

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

Step 4.4.1.2

Simplify by adding terms.

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Step 4.4.1.2.1

Subtract $12$ from $8$ .

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

$- \frac{15 z}{2} - 21 = 9$

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

Step 4.4.1.2.2

Subtract $3 z$ from $2 z$ .

$y = - 4 - z$

$- \frac{15 z}{2} - 21 = 9$

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

$y = - 4 - z$

$- \frac{15 z}{2} - 21 = 9$

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

$y = - 4 - z$

$- \frac{15 z}{2} - 21 = 9$

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

$y = - 4 - z$

$- \frac{15 z}{2} - 21 = 9$

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

$y = - 4 - z$

$- \frac{15 z}{2} - 21 = 9$

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

Step 5

Solve for $z$ in $- \frac{15 z}{2} - 21 = 9$ .

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Step 5.1

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

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Step 5.1.1

Add $21$ to both sides of the equation.

$- \frac{15 z}{2} = 9 + 21$

$y = - 4 - z$

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

Step 5.1.2

Add $9$ and $21$ .

$- \frac{15 z}{2} = 30$

$y = - 4 - z$

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

$- \frac{15 z}{2} = 30$

$y = - 4 - z$

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

Step 5.2

Multiply both sides of the equation by $- \frac{2}{15}$ .

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

$y = - 4 - z$

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

Step 5.3

Simplify both sides of the equation.

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Step 5.3.1

Simplify the left side.

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Step 5.3.1.1

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

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Step 5.3.1.1.1

Cancel the common factor of $2$ .

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Step 5.3.1.1.1.1

Move the leading negative in $- \frac{2}{15}$ into the numerator.

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

$y = - 4 - z$

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

Step 5.3.1.1.1.2

Move the leading negative in $- \frac{15 z}{2}$ into the numerator.

$\frac{- 2}{15} \cdot \frac{- 15 z}{2} = - \frac{2}{15} \cdot 30$

$y = - 4 - z$

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

Step 5.3.1.1.1.3

Factor $2$ out of $- 2$ .

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

$y = - 4 - z$

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

Step 5.3.1.1.1.4

Cancel the common factor.

$\frac{2 \cdot - 1}{15} \cdot \frac{- 15 z}{2} = - \frac{2}{15} \cdot 30$

$y = - 4 - z$

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

Step 5.3.1.1.1.5

Rewrite the expression.

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

$y = - 4 - z$

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

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

$y = - 4 - z$

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

Step 5.3.1.1.2

Cancel the common factor of $15$ .

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Step 5.3.1.1.2.1

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

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

$y = - 4 - z$

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

Step 5.3.1.1.2.2

Cancel the common factor.

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

$y = - 4 - z$

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

Step 5.3.1.1.2.3

Rewrite the expression.

$z = - \frac{2}{15} \cdot 30$

$y = - 4 - z$

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

$z = - \frac{2}{15} \cdot 30$

$y = - 4 - z$

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

Step 5.3.1.1.3

Multiply.

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Step 5.3.1.1.3.1

Multiply $- 1$ by $- 1$ .

$1 z = - \frac{2}{15} \cdot 30$

$y = - 4 - z$

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

Step 5.3.1.1.3.2

Multiply $z$ by $1$ .

$z = - \frac{2}{15} \cdot 30$

$y = - 4 - z$

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

$z = - \frac{2}{15} \cdot 30$

$y = - 4 - z$

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

$z = - \frac{2}{15} \cdot 30$

$y = - 4 - z$

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

$z = - \frac{2}{15} \cdot 30$

$y = - 4 - z$

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

Step 5.3.2

Simplify the right side.

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Step 5.3.2.1

Simplify $- \frac{2}{15} \cdot 30$ .

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Step 5.3.2.1.1

Cancel the common factor of $15$ .

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Step 5.3.2.1.1.1

Move the leading negative in $- \frac{2}{15}$ into the numerator.

$z = \frac{- 2}{15} \cdot 30$

$y = - 4 - z$

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

Step 5.3.2.1.1.2

Factor $15$ out of $30$ .

$z = \frac{- 2}{15} \cdot (15 (2))$

$y = - 4 - z$

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

Step 5.3.2.1.1.3

Cancel the common factor.

$z = \frac{- 2}{15} \cdot (15 \cdot 2)$

$y = - 4 - z$

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

Step 5.3.2.1.1.4

Rewrite the expression.

$z = - 2 \cdot 2$

$y = - 4 - z$

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

$z = - 2 \cdot 2$

$y = - 4 - z$

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

Step 5.3.2.1.2

Multiply $- 2$ by $2$ .

$z = - 4$

$y = - 4 - z$

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

$z = - 4$

$y = - 4 - z$

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

$z = - 4$

$y = - 4 - z$

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

$z = - 4$

$y = - 4 - z$

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

$z = - 4$

$y = - 4 - z$

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

Step 6

Replace all occurrences of $z$ with $- 4$ in each equation.

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Step 6.1

Replace all occurrences of $z$ in $y = - 4 - z$ with $- 4$ .

$y = - 4 - (- 4)$

$z = - 4$

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

Step 6.2

Simplify the right side.

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Step 6.2.1

Simplify $- 4 - (- 4)$ .

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Step 6.2.1.1

Multiply $- 1$ by $- 4$ .

$y = - 4 + 4$

$z = - 4$

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

Step 6.2.1.2

Add $- 4$ and $4$ .

$y = 0$

$z = - 4$

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

$y = 0$

$z = - 4$

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

$y = 0$

$z = - 4$

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

Step 6.3

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

$x = - 3 + \frac{- 4}{2}$

$y = 0$

$z = - 4$

Step 6.4

Simplify the right side.

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Step 6.4.1

Simplify $- 3 + \frac{- 4}{2}$ .

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Step 6.4.1.1

Divide $- 4$ by $2$ .

$x = - 3 - 2$

$y = 0$

$z = - 4$

Step 6.4.1.2

Subtract $2$ from $- 3$ .

$x = - 5$

$y = 0$

$z = - 4$

$x = - 5$

$y = 0$

$z = - 4$

$x = - 5$

$y = 0$

$z = - 4$

$x = - 5$

$y = 0$

$z = - 4$

Step 7

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

$(- 5, 0, - 4)$

Step 8

The result can be shown in multiple forms.

Point Form:

$(- 5, 0, - 4)$

Equation Form:

$x = - 5, y = 0, z = - 4$