$\"\"$

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The equation is $\"\"$ .

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Subtract 7 from each side.

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$\"\"$

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$\"\"$

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Divide each side by 3.

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$\"\"$

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$\"\"$

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$\"\"$

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Check:

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To check the solution, substitute $\"\"$ in original equation.

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$\"\"$

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$\"\"$

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$\"\"$

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The solution is true. $\"\"$

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The value of $\"\"$ .