S(n)=0.4(2n-1)

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Solution for S(n)=0.4(2n-1) equation: 



(S)=0.4(2S-1)

We move all terms to the left:

(S)-(0.4(2S-1))=0



We calculate terms in parentheses: -(0.4(2S-1)), so:

0.4(2S-1)

We multiply parentheses

0.8S-0.4

Back to the equation:

-(0.8S-0.4)



We get rid of parentheses

S-0.8S+0.4=0

We add all the numbers together, and all the variables

0.2S+0.4=0

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

0.2S=-0.4

S=-0.4/0.2

S=-2

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