$\"\"$

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The expression is $\"\"$ .

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$\"\"$ (Apply distributive property: $\"\"$ )

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

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$\"\"$ (Product of two opposite signs is positive)

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$\"\"$ (Grouping like terms)

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

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The difference of $\"\"$ is $\"\"$ .