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-12=13+m
We move all terms to the left:
-12-(13+m)=0
We add all the numbers together, and all the variables
-(m+13)-12=0
We get rid of parentheses
-m-13-12=0
We add all the numbers together, and all the variables
-1m-25=0
We move all terms containing m to the left, all other terms to the right
-m=25
m=25/-1
m=-25
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