s=4s-21

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Solution for s=4s-21 equation: 



s=4s-21

We move all terms to the left:

s-(4s-21)=0

We get rid of parentheses

s-4s+21=0

We add all the numbers together, and all the variables

-3s+21=0

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

-3s=-21

s=-21/-3

s=+7

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