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-9=11m-(8m)
We move all terms to the left:
-9-(11m-(8m))=0
We add all the numbers together, and all the variables
-(+3m)-9=0
We get rid of parentheses
-3m-9=0
We move all terms containing m to the left, all other terms to the right
-3m=9
m=9/-3
m=-3
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