21=3(s+4)

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Solution for 21=3(s+4) equation: 



21=3(s+4)

We move all terms to the left:

21-(3(s+4))=0



We calculate terms in parentheses: -(3(s+4)), so:

3(s+4)

We multiply parentheses

3s+12

Back to the equation:

-(3s+12)



We get rid of parentheses

-3s-12+21=0

We add all the numbers together, and all the variables

-3s+9=0

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

-3s=-9

s=-9/-3

s=+3

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