$\"\"$

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The limit expression is $\"\"$ .

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$\"\"$

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Apply sum and difference property of limits: $\"\"$ .

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$\"\"$

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Apply scalar multiple property of limits: $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Therefore, $\"\"$ .

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$\"\"$

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$\"\"$ .