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-231=3.5m
We move all terms to the left:
-231-(3.5m)=0
We add all the numbers together, and all the variables
-(+3.5m)-231=0
We get rid of parentheses
-3.5m-231=0
We move all terms containing m to the left, all other terms to the right
-3.5m=231
m=231/-3.5
m=-66
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