-31=8m+9

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Solution for -31=8m+9 equation: 



-31=8m+9

We move all terms to the left:

-31-(8m+9)=0

We get rid of parentheses

-8m-9-31=0

We add all the numbers together, and all the variables

-8m-40=0

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

-8m=40

m=40/-8

m=-5

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