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

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The equation is $\"\"$ .

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According to subtraction property of equality:Subtract 9 from each side.

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$\"\"$

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$\"\"$ (Additive inverse property: $\"\"$ )

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$\"\"$ (Additive identity property: $\"\"$ ) $\"\"$

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

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$\"\"$ (Cancel common terms)

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$\"\"$ (Simplify) $\"\"$

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$\"\"$ (Substitute x = 9)

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

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

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$\"\"$ (Subtract: $\"\"$ ) $\"\"$

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The value of $\"\"$ .