S4=(-3+9k)

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Solution for S4=(-3+9k) equation: 



4=(-3+9S)

We move all terms to the left:

4-((-3+9S))=0

We add all the numbers together, and all the variables

-((9S-3))+4=0



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

(9S-3)

We get rid of parentheses

9S-3

Back to the equation:

-(9S-3)



We get rid of parentheses

-9S+3+4=0

We add all the numbers together, and all the variables

-9S+7=0

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

-9S=-7

S=-7/-9

S=7/9

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