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90=11+2m+m+7
We move all terms to the left:
90-(11+2m+m+7)=0
We add all the numbers together, and all the variables
-(3m+18)+90=0
We get rid of parentheses
-3m-18+90=0
We add all the numbers together, and all the variables
-3m+72=0
We move all terms containing m to the left, all other terms to the right
-3m=-72
m=-72/-3
m=+24
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