The statement is $\"\"$ .

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Given that : $\"\"$ .

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Subtract $\"\"$ from each side.

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$\"\"$

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$\"\"$

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Substitute the value $\"\"$ in the statement.

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$\"\"$

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Apply formula : $\"\"$ .

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$\"\"$

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Apply distributive property : $\"\"$ .

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$\"\"$

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Group like terms.

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$\"\"$

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$\"\"$

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$\"\"$ .

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Hence,the statement was proved.