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-42=3m-12+6m
We simplify the equation to the form, which is simple to understand
-42=3m-12+6m
We move all terms containing m to the left and all other terms to the right.
-3m-6m=-12+42
We simplify left and right side of the equation.
-9m=+30
We divide both sides of the equation by -9 to get m.
m=-3.3333333333333
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