$\"\"$

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The expression is $\"\"$ .

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

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

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

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

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

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The solution is $\"\"$ .