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-2m=m-15
We move all terms to the left:
-2m-(m-15)=0
We get rid of parentheses
-2m-m+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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