21=7(s+-4)

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Solution for 21=7(s+-4) equation: 



21=7(s+-4)

We move all terms to the left:

21-(7(s+-4))=0

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(7(s-4)), so:

7(s-4)

We multiply parentheses

7s-28

Back to the equation:

-(7s-28)



We get rid of parentheses

-7s+28+21=0

We add all the numbers together, and all the variables

-7s+49=0

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

-7s=-49

s=-49/-7

s=+7

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