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-3m+9=6m-18
We move all terms to the left:
-3m+9-(6m-18)=0
We get rid of parentheses
-3m-6m+18+9=0
We add all the numbers together, and all the variables
-9m+27=0
We move all terms containing m to the left, all other terms to the right
-9m=-27
m=-27/-9
m=+3
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