31=2x-9

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Solution for 31=2x-9 equation: 



31=2x-9

We move all terms to the left:

31-(2x-9)=0

We get rid of parentheses

-2x+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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