9x-31=9+11x

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Solution for 9x-31=9+11x equation: 



9x-31=9+11x

We move all terms to the left:

9x-31-(9+11x)=0

We add all the numbers together, and all the variables

9x-(11x+9)-31=0

We get rid of parentheses

9x-11x-9-31=0

We add all the numbers together, and all the variables

-2x-40=0

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

-2x=40

x=40/-2

x=-20

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