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20=-8+m
We move all terms to the left:
20-(-8+m)=0
We add all the numbers together, and all the variables
-(m-8)+20=0
We get rid of parentheses
-m+8+20=0
We add all the numbers together, and all the variables
-1m+28=0
We move all terms containing m to the left, all other terms to the right
-m=-28
m=-28/-1
m=+28
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