$\"\"$

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The expression is $\"\"$ .

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Apply subtraction property of equality: Subtract 3z from each side.

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$\"\"$

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$\"\"$ (Apply commutative property of addition: $\"\"$ ) \ \

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$\"\"$ (Apply additive inverse property: $\"\"$ ) \ \

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$\"\"$ (Apply additive identity property: $\"\"$ ) \ \

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$\"\"$ (Subtract: $\"\"$ ) \ \ $\"\"$

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$\"\"$ (Add 4 to each side)

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$\"\"$ (Apply additive inverse property: $\"\"$ ) \ \

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$\"\"$ (Apply additive identity property: $\"\"$ )

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$\"\"$ (Add: $\"\"$ ) $\"\"$

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$\"\"$ (Divide each side by 4) \ \

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$\"\"$ (Cancel common terms) \ \

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$\"\"$ (Divide: $\"\"$ ) $\"\"$

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Check:

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To check the solution, substitute $\"\"$ in original equation.

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$\"\"$

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$\"\"$ (Multiply: $\"\"$ ) \ \

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$\"\"$ (Subtract: $\"\"$ )

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$\"\"$ (Add: $\"\"$ ) \ \

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The statement is true.

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$\"\"$

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The solution is $\"\"$ . \ \