The statement is $\"\"$ .

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Multiply 3 to each side. \ \ $\"\"$

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Cancel common terms. \ \

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$\"\"$

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Apply distributive property : $\"\"$ .

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$\"\"$

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Subtract 3b to each side.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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Therefore,the solution of $\"\"$ .