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