$\"\"$

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The equation is $\"\"$ .

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Distribute terms using distributive property: $\"\"$ .

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$\"\"$ $\"\"$

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Apply subtraction property of equality: If a = b then a $\"\"$ b = b $\"\"$ a.

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$\"\"$

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Apply commutative property of addition: $\"\"$ .

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$\"\"$

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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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Apply division property of equality: If a = b then $\"\"$ .

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

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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 z = 4, in $\"\"$ .

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$\"\"$ (Substitute $\"\"$ )

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

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

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

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The equation is true. $\"\"$

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The solution of $\"\"$ .