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-12+3m=8m-28
We move all terms to the left:
-12+3m-(8m-28)=0
We get rid of parentheses
3m-8m+28-12=0
We add all the numbers together, and all the variables
-5m+16=0
We move all terms containing m to the left, all other terms to the right
-5m=-16
m=-16/-5
m=3+1/5
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