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-3+6m=2m+9
We move all terms to the left:
-3+6m-(2m+9)=0
We get rid of parentheses
6m-2m-9-3=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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