21=-6s-2s

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Solution for 21=-6s-2s equation: 



21=-6s-2s

We move all terms to the left:

21-(-6s-2s)=0

We add all the numbers together, and all the variables

-(-8s)+21=0

We get rid of parentheses

8s+21=0

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

8s=-21

s=-21/8

s=-2+5/8

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