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

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The proportion is $\"\"$

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$\"\"$ (Apply cross products property)

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$\"\"$ (Multiply: $\"\"$ ) $\"\"$

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$\"\"$ (Divide each side by 2)

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$\"\"$ (Cancel common terms)

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$\"\"$ (Divide: $\"\"$ ) $\"\"$

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The value of $\"\"$ .