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12+m=4-3m
We move all terms to the left:
12+m-(4-3m)=0
We add all the numbers together, and all the variables
m-(-3m+4)+12=0
We get rid of parentheses
m+3m-4+12=0
We add all the numbers together, and all the variables
4m+8=0
We move all terms containing m to the left, all other terms to the right
4m=-8
m=-8/4
m=-2
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