$\"\"$

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The equation is $\"\"$ .

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$\"\"$

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$\"\"$

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Subtract 2p from each side.

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$\"\"$

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$\"\"$

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$\"\"$

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Subtract 21 from each side.

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$\"\"$

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$\"\"$

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Divide each side by 5.

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$\"\"$

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$\"\"$

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$\"\"$

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The value of $\"\"$ .