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9m=12m+15
We move all terms to the left:
9m-(12m+15)=0
We get rid of parentheses
9m-12m-15=0
We add all the numbers together, and all the variables
-3m-15=0
We move all terms containing m to the left, all other terms to the right
-3m=15
m=15/-3
m=-5
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