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-12=1+3m-1
We move all terms to the left:
-12-(1+3m-1)=0
We add all the numbers together, and all the variables
-(+3m)-12=0
We get rid of parentheses
-3m-12=0
We move all terms containing m to the left, all other terms to the right
-3m=12
m=12/-3
m=-4
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