$\"\"$

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The function is $\"\"$ .

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$\"\"$ (Original function)

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$\"\"$ (Set the denominator equal to zero)

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$\"\"$ (Add $\"\"$ to each side)

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$\"\"$ (Apply additive inverse property: $\"\"$ )

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Therefore, the excluded value is $\"\"$ . $\"\"$

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The excluded value is $\"\"$ .