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-(12+3m)=6
We move all terms to the left:
-(12+3m)-(6)=0
We add all the numbers together, and all the variables
-(3m+12)-6=0
We get rid of parentheses
-3m-12-6=0
We add all the numbers together, and all the variables
-3m-18=0
We move all terms containing m to the left, all other terms to the right
-3m=18
m=18/-3
m=-6
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