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3 - x = 12

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1 Answer

3 - x = 12

Add x to both sides

3 - x + x = 12 + x

3 = 12 + x               (- x and + x cancel each other out)

Subtract 12 from both sides

3 - 12 = 12 + x - 12

-9 = x                  (3 + -12 = -9)