21=-3(11-s)

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Solution for 21=-3(11-s) equation: 



21=-3(11-s)

We move all terms to the left:

21-(-3(11-s))=0

We add all the numbers together, and all the variables

-(-3(-1s+11))+21=0



We calculate terms in parentheses: -(-3(-1s+11)), so:

-3(-1s+11)

We multiply parentheses

3s-33

Back to the equation:

-(3s-33)



We get rid of parentheses

-3s+33+21=0

We add all the numbers together, and all the variables

-3s+54=0

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

-3s=-54

s=-54/-3

s=+18

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