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3m-(7m=12)=2(m-3)
We move all terms to the left:
3m-(7m-(12))=0
We get rid of parentheses
3m-7m+12=0
We add all the numbers together, and all the variables
-4m+12=0
We move all terms containing m to the left, all other terms to the right
-4m=-12
m=-12/-4
m=+3
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