$\"\"$

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The equation is $\"\"$ .

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Solve the equation $\"\"$ for x.

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Apply distributive property : $\"\"$ .

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$\"\"$

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$\"\"$

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Add 28 to each side.

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$\"\"$

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$\"\"$

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$\"\"$ . $\"\"$

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Divide each side by 21.

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$\"\"$

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Cancel common terms.

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$\"\"$ . $\"\"$

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The value of $\"\"$ .