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-15-2m=m+3
We move all terms to the left:
-15-2m-(m+3)=0
We get rid of parentheses
-2m-m-3-15=0
We add all the numbers together, and all the variables
-3m-18=0
We move all terms containing m to the left, all other terms to the right
-3m=18
m=18/-3
m=-6
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