-x=-40+9

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Solution for -x=-40+9 equation: 



-x=-40+9

We move all terms to the left:

-x-(-40+9)=0

We add all the numbers together, and all the variables

-x-(-31)=0

We add all the numbers together, and all the variables

-1x+31=0

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

-x=-31

x=-31/-1

x=+31

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