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18=3+m
We move all terms to the left:
18-(3+m)=0
We add all the numbers together, and all the variables
-(m+3)+18=0
We get rid of parentheses
-m-3+18=0
We add all the numbers together, and all the variables
-1m+15=0
We move all terms containing m to the left, all other terms to the right
-m=-15
m=-15/-1
m=+15
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