9-x-x=31

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Solution for 9-x-x=31 equation: 



9-x-x=31

We move all terms to the left:

9-x-x-(31)=0

We add all the numbers together, and all the variables

-2x-22=0

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

-2x=22

x=22/-2

x=-11

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