$\"\"$

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The equation is $\"\"$ .

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Solve the equation $\"\"$ for p.

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Subtract 9 from each side.

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$\"\"$

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$\"\"$

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$\"\"$

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Divide each side by negative 3.

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$\"\"$

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Cancel common terms.

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$\"\"$ . $\"\"$

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The value of $\"\"$ .