13=s-7

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Solution for 13=s-7 equation: 



13=s-7

We move all terms to the left:

13-(s-7)=0

We get rid of parentheses

-s+7+13=0

We add all the numbers together, and all the variables

-1s+20=0

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

-s=-20

s=-20/-1

s=+20

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