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3m-12=3+4m
We move all terms to the left:
3m-12-(3+4m)=0
We add all the numbers together, and all the variables
3m-(4m+3)-12=0
We get rid of parentheses
3m-4m-3-12=0
We add all the numbers together, and all the variables
-1m-15=0
We move all terms containing m to the left, all other terms to the right
-m=15
m=15/-1
m=-15
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