12=15+m

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Solution for 12=15+m equation: 



12=15+m

We move all terms to the left:

12-(15+m)=0

We add all the numbers together, and all the variables

-(m+15)+12=0

We get rid of parentheses

-m-15+12=0

We add all the numbers together, and all the variables

-1m-3=0

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

-m=3

m=3/-1

m=-3

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