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231=15+12m
We move all terms to the left:
231-(15+12m)=0
We add all the numbers together, and all the variables
-(12m+15)+231=0
We get rid of parentheses
-12m-15+231=0
We add all the numbers together, and all the variables
-12m+216=0
We move all terms containing m to the left, all other terms to the right
-12m=-216
m=-216/-12
m=+18
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