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6+7m=3+9m-2-3m
We move all terms to the left:
6+7m-(3+9m-2-3m)=0
We add all the numbers together, and all the variables
7m-(6m+1)+6=0
We get rid of parentheses
7m-6m-1+6=0
We add all the numbers together, and all the variables
m+5=0
We move all terms containing m to the left, all other terms to the right
m=-5
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