81=-9(s-3)

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Solution for 81=-9(s-3) equation: 



81=-9(s-3)

We move all terms to the left:

81-(-9(s-3))=0



We calculate terms in parentheses: -(-9(s-3)), so:

-9(s-3)

We multiply parentheses

-9s+27

Back to the equation:

-(-9s+27)



We get rid of parentheses

9s-27+81=0

We add all the numbers together, and all the variables

9s+54=0

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

9s=-54

s=-54/9

s=-6

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