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12-3m=8-m
We move all terms to the left:
12-3m-(8-m)=0
We add all the numbers together, and all the variables
-3m-(-1m+8)+12=0
We get rid of parentheses
-3m+1m-8+12=0
We add all the numbers together, and all the variables
-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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