$\"\"$

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The expression is $\"\"$ .

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Simplify the expression.

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$\"\"$ (Original expression)

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

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$\"\"$ (Take out common factor)

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$\"\"$ (Differences of squares: $\"\"$ )

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$\"\"$ (Eliminate common factors)

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$\"\"$ .

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$\"\"$

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The simplified expression is $\"\"$ .