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

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The expression is $\"\"$ .

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$\"\"$ (Distributive property: $\"\"$ )

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

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$\"\"$

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Apply subtraction property of equality: if $\"\"$

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$\"\"$ (Subtract 8n from each side)

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$\"\"$ (Additive inverse property: $\"\"$ )

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$\"\"$ (Additive identity property: $\"\"$ )

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

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

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