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-4m=12-3m
We move all terms to the left:
-4m-(12-3m)=0
We add all the numbers together, and all the variables
-4m-(-3m+12)=0
We get rid of parentheses
-4m+3m-12=0
We add all the numbers together, and all the variables
-1m-12=0
We move all terms containing m to the left, all other terms to the right
-m=12
m=12/-1
m=-12
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