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

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

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$\"\"$ (Apply distributive proeperty: $\"\"$ )

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

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$\"\"$

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According to addition property of equality: if $\"\"$ than $\"\"$ .

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$\"\"$ (Add 18 to each side)

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$\"\"$ (Apply additive inverse proerpty: $\"\"$ )

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$\"\"$ (Apply additive identity proerpty: $\"\"$ )

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$\"\"$ (Add: $\"\"$ ) $\"\"$

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According to division property of equality: if $\"\"$ than $\"\"$ .

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$\"\"$ (Divide each side by 6)

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$\"\"$ (Cancel common terms)

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

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The bar indicates repeating decimal.

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$\"\"$

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The value of $\"\"$ .