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3m+4=-2m-12-3m
We move all terms to the left:
3m+4-(-2m-12-3m)=0
We add all the numbers together, and all the variables
3m-(-5m-12)+4=0
We get rid of parentheses
3m+5m+12+4=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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