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90=3m-36
We move all terms to the left:
90-(3m-36)=0
We get rid of parentheses
-3m+36+90=0
We add all the numbers together, and all the variables
-3m+126=0
We move all terms containing m to the left, all other terms to the right
-3m=-126
m=-126/-3
m=+42
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