-21=3(7s-8)

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Solution for -21=3(7s-8) equation: 



-21=3(7s-8)

We move all terms to the left:

-21-(3(7s-8))=0



We calculate terms in parentheses: -(3(7s-8)), so:

3(7s-8)

We multiply parentheses

21s-24

Back to the equation:

-(21s-24)



We get rid of parentheses

-21s+24-21=0

We add all the numbers together, and all the variables

-21s+3=0

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

-21s=-3

s=-3/-21

s=1/7

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