13=s-21

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Solution for 13=s-21 equation: 



13=s-21

We move all terms to the left:

13-(s-21)=0

We get rid of parentheses

-s+21+13=0

We add all the numbers together, and all the variables

-1s+34=0

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

-s=-34

s=-34/-1

s=+34

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