-21=s-91

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Solution for -21=s-91 equation: 



-21=s-91

We move all terms to the left:

-21-(s-91)=0

We get rid of parentheses

-s+91-21=0

We add all the numbers together, and all the variables

-1s+70=0

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

-s=-70

s=-70/-1

s=+70

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