21=3s+-4(28-s)

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Solution for 21=3s+-4(28-s) equation: 



21=3s+-4(28-s)

We move all terms to the left:

21-(3s+-4(28-s))=0

We add all the numbers together, and all the variables

-(3s+-4(-1s+28))+21=0

We use the square of the difference formula

-(3s-4(-1s+28))+21=0



We calculate terms in parentheses: -(3s-4(-1s+28)), so:

3s-4(-1s+28)

We multiply parentheses

3s+4s-112

We add all the numbers together, and all the variables

7s-112

Back to the equation:

-(7s-112)



We get rid of parentheses

-7s+112+21=0

We add all the numbers together, and all the variables

-7s+133=0

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

-7s=-133

s=-133/-7

s=+19

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