-15=3+m

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Solution for -15=3+m equation: 



-15=3+m

We move all terms to the left:

-15-(3+m)=0

We add all the numbers together, and all the variables

-(m+3)-15=0

We get rid of parentheses

-m-3-15=0

We add all the numbers together, and all the variables

-1m-18=0

We move all terms containing m to the left, all other terms to the right

-m=18

m=18/-1

m=-18

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