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12m-8=3m-125
We move all terms to the left:
12m-8-(3m-125)=0
We get rid of parentheses
12m-3m+125-8=0
We add all the numbers together, and all the variables
9m+117=0
We move all terms containing m to the left, all other terms to the right
9m=-117
m=-117/9
m=-13
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