S(x)=400-100x

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Solution for S(x)=400-100x equation: 



(S)=400-100S

We move all terms to the left:

(S)-(400-100S)=0

We add all the numbers together, and all the variables

S-(-100S+400)=0

We get rid of parentheses

S+100S-400=0

We add all the numbers together, and all the variables

101S-400=0

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

101S=400

S=400/101

S=3+97/101

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