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12-5m=8m-7m
We move all terms to the left:
12-5m-(8m-7m)=0
We add all the numbers together, and all the variables
-5m-(+m)+12=0
We get rid of parentheses
-5m-m+12=0
We add all the numbers together, and all the variables
-6m+12=0
We move all terms containing m to the left, all other terms to the right
-6m=-12
m=-12/-6
m=+2
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