9+2x-4x=-31

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Solution for 9+2x-4x=-31 equation: 



9+2x-4x=-31

We move all terms to the left:

9+2x-4x-(-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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