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

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The equation is $\"\"$ \ \

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$\"\"$ (Divide each side by 7)

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$\"\"$ (Cancel common terms)

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$\"\"$

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$\"\"$

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Check:

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Substitutive the value $\"\"$ on original equation.

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$\"\"$

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$\"\"$ (Cancel common terms)

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$\"\"$

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The solution $\"\"$ .

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