\"\"

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The equation is \"\".

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Apply subtraction property of equality: Subtract 12 from each side.

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\"\"

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\"\"                (Apply additive identity property: \"\")

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

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\"\"                              (Add: \"\")\"\"

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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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\"\"                         (Add: \"\")

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The statement is true.\"\"

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The value of \"\".