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