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m=-4+2m
We move all terms to the left:
m-(-4+2m)=0
We add all the numbers together, and all the variables
m-(2m-4)=0
We get rid of parentheses
m-2m+4=0
We add all the numbers together, and all the variables
-1m+4=0
We move all terms containing m to the left, all other terms to the right
-m=-4
m=-4/-1
m=+4
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