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

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The equation is $\"\"$ .

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According to subtraction property of equality: Subtract 2z 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: $\"\"$ ) $\"\"$ $\"\"$ (Subtract b from each side)

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

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

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According to division property of equality: Divide each side by 2.

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$\"\"$

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

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The value of z is $\"\"$ .