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$\"\"$

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The equation is $\"\"$ .

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$\"\"$ (Subtract y from each side)

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$\"\"$ (Additive inverse property: y – y = 0)

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$\"\"$ (Multiply each side by 2)

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Distributive property: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$

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The value of $\"\"$ .

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