$\"\"$

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The expression is $\"\"$ .

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Take out common factor numerator and denominator by 6 and 14.

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$\"\"$

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Apply difference of two squares: $\"\"$ .

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$\"\"$ $\"\"$

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Factor the denominator: $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The simplified expression is $\"\"$ .