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-4=-m+8-2m
We move all terms to the left:
-4-(-m+8-2m)=0
We add all the numbers together, and all the variables
-(-3m+8)-4=0
We get rid of parentheses
3m-8-4=0
We add all the numbers together, and all the variables
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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