-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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