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12=8m-4
We move all terms to the left:
12-(8m-4)=0
We get rid of parentheses
-8m+4+12=0
We add all the numbers together, and all the variables
-8m+16=0
We move all terms containing m to the left, all other terms to the right
-8m=-16
m=-16/-8
m=+2
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