-31=9+8x

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Solution for -31=9+8x equation: 



-31=9+8x

We move all terms to the left:

-31-(9+8x)=0

We add all the numbers together, and all the variables

-(8x+9)-31=0

We get rid of parentheses

-8x-9-31=0

We add all the numbers together, and all the variables

-8x-40=0

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

-8x=40

x=40/-8

x=-5

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