$\"\"$

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The expression is $\"\"$ .

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$\"\"$

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$\"\"$ (product of two different signs is negative) \ \

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The common denominator is $\"\"$ , So $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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= 1

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$\"\"$

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The simplified expression is 1.