S(x)=-20+2.5x

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Solution for S(x)=-20+2.5x equation: 



(S)=-20+2.5S

We move all terms to the left:

(S)-(-20+2.5S)=0

We add all the numbers together, and all the variables

S-(2.5S-20)=0

We get rid of parentheses

S-2.5S+20=0

We add all the numbers together, and all the variables

-1.5S+20=0

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

-1.5S=-20

S=-20/-1.5

S=13+0.5/1.5

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