21=s+2s

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Solution for 21=s+2s equation: 



21=s+2s

We move all terms to the left:

21-(s+2s)=0

We add all the numbers together, and all the variables

-(+3s)+21=0

We get rid of parentheses

-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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