-31=9-2m

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Solution for -31=9-2m equation: 



-31=9-2m

We move all terms to the left:

-31-(9-2m)=0

We add all the numbers together, and all the variables

-(-2m+9)-31=0

We get rid of parentheses

2m-9-31=0

We add all the numbers together, and all the variables

2m-40=0

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

2m=40

m=40/2

m=20

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