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12=m+7m=
We move all terms to the left:
12-(m+7m)=0
We add all the numbers together, and all the variables
-(+8m)+12=0
We get rid of parentheses
-8m+12=0
We move all terms containing m to the left, all other terms to the right
-8m=-12
m=-12/-8
m=1+1/2
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