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12m+40=-3m-51+8m
We move all terms to the left:
12m+40-(-3m-51+8m)=0
We add all the numbers together, and all the variables
12m-(5m-51)+40=0
We get rid of parentheses
12m-5m+51+40=0
We add all the numbers together, and all the variables
7m+91=0
We move all terms containing m to the left, all other terms to the right
7m=-91
m=-91/7
m=-13
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