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

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The expression is $\"\"$ .

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$\"\"$ (Distrbute 7)

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

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Combine like terms using distributive property: $\"\"$ .

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$\"\"$

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

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The simplified expression is $\"\"$ .