-8=31+x

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Solution for -8=31+x equation: 



-8=31+x

We move all terms to the left:

-8-(31+x)=0

We add all the numbers together, and all the variables

-(x+31)-8=0

We get rid of parentheses

-x-31-8=0

We add all the numbers together, and all the variables

-1x-39=0

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

-x=39

x=39/-1

x=-39

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