Sn=(n-2)420

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Solution for Sn=(n-2)420 equation: 



S=(S-2)420

We move all terms to the left:

S-((S-2)420)=0



We calculate terms in parentheses: -((S-2)420), so:

(S-2)420

We multiply parentheses

420S-840

Back to the equation:

-(420S-840)



We get rid of parentheses

S-420S+840=0

We add all the numbers together, and all the variables

-419S+840=0

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

-419S=-840

S=-840/-419

S=2+2/419

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