$\"\"$

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The equation is $\"\"$ .

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$\"\"$ (Add $\"\"$ to each side)

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$\"\"$ (Apply additive inverse property : $\"\"$ )

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

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$\"\"$ (Cancel common terms)

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$\"\"$ .

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$\"\"$

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The formula for $\"\"$ is $\"\"$ .