$\"\"$

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The equation is $\"\"$ .

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Apply formula: if $\"\"$ then m = n.

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$\"\"$

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Subtract r from each side. \ \

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$\"\"$

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$\"\"$

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$\"\"$

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Add 1 to each side.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The value of $\"\"$ .