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4m=2m-12
We move all terms to the left:
4m-(2m-12)=0
We get rid of parentheses
4m-2m+12=0
We add all the numbers together, and all the variables
2m+12=0
We move all terms containing m to the left, all other terms to the right
2m=-12
m=-12/2
m=-6
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