-8=13+s

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Solution for -8=13+s equation: 



-8=13+s

We move all terms to the left:

-8-(13+s)=0

We add all the numbers together, and all the variables

-(s+13)-8=0

We get rid of parentheses

-s-13-8=0

We add all the numbers together, and all the variables

-1s-21=0

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

-s=21

s=21/-1

s=-21

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