$\"\"$

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The proportion is $\"\"$ .

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Apply cross product property: If $\"\"$ , then $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ $\"\"$

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Subtract 108 from each side.

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$\"\"$

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$\"\"$

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Divide each side by negative 36.

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$\"\"$

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$\"\"$

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$\"\"$

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The value of $\"\"$ .