-13=m+8

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Solution for -13=m+8 equation: 



-13=m+8

We move all terms to the left:

-13-(m+8)=0

We get rid of parentheses

-m-8-13=0

We add all the numbers together, and all the variables

-1m-21=0

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

-m=21

m=21/-1

m=-21

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