21=3(s+2)

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Solution for 21=3(s+2) equation: 



21=3(s+2)

We move all terms to the left:

21-(3(s+2))=0



We calculate terms in parentheses: -(3(s+2)), so:

3(s+2)

We multiply parentheses

3s+6

Back to the equation:

-(3s+6)



We get rid of parentheses

-3s-6+21=0

We add all the numbers together, and all the variables

-3s+15=0

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

-3s=-15

s=-15/-3

s=+5

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