-31=-12+m

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Solution for -31=-12+m equation: 



-31=-12+m

We move all terms to the left:

-31-(-12+m)=0

We add all the numbers together, and all the variables

-(m-12)-31=0

We get rid of parentheses

-m+12-31=0

We add all the numbers together, and all the variables

-1m-19=0

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

-m=19

m=19/-1

m=-19

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