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2-3m=7m+12
We move all terms to the left:
2-3m-(7m+12)=0
We get rid of parentheses
-3m-7m-12+2=0
We add all the numbers together, and all the variables
-10m-10=0
We move all terms containing m to the left, all other terms to the right
-10m=10
m=10/-10
m=-1
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