S=(n-2)(180)

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Solution for S=(n-2)(180) equation: 



=(S-2)(180)

We move all terms to the left:

-((S-2)(180))=0



We calculate terms in parentheses: -((S-2)180), so:

(S-2)180

We multiply parentheses

180S-360

Back to the equation:

-(180S-360)



We get rid of parentheses

-180S+360=0

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

-180S=-360

S=-360/-180

S=+2

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