28=3s-4(21-s)

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



28=3s-4(21-s)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(3s-4(-1s+21)), so:

3s-4(-1s+21)

We multiply parentheses

3s+4s-84

We add all the numbers together, and all the variables

7s-84

Back to the equation:

-(7s-84)



We get rid of parentheses

-7s+84+28=0

We add all the numbers together, and all the variables

-7s+112=0

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

-7s=-112

s=-112/-7

s=+16

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