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-1=-3+m
We move all terms to the left:
-1-(-3+m)=0
We add all the numbers together, and all the variables
-(m-3)-1=0
We get rid of parentheses
-m+3-1=0
We add all the numbers together, and all the variables
-1m+2=0
We move all terms containing m to the left, all other terms to the right
-m=-2
m=-2/-1
m=+2
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