20=-4(s-7)

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Solution for 20=-4(s-7) equation: 



20=-4(s-7)

We move all terms to the left:

20-(-4(s-7))=0



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

-4(s-7)

We multiply parentheses

-4s+28

Back to the equation:

-(-4s+28)



We get rid of parentheses

4s-28+20=0

We add all the numbers together, and all the variables

4s-8=0

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

4s=8

s=8/4

s=2

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