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12m-15=3m+39
We move all terms to the left:
12m-15-(3m+39)=0
We get rid of parentheses
12m-3m-39-15=0
We add all the numbers together, and all the variables
9m-54=0
We move all terms containing m to the left, all other terms to the right
9m=54
m=54/9
m=6
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