18=3+m

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Solution for 18=3+m equation: 



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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