S(x)=(40-2x)(30-2x

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Solution for S(x)=(40-2x)(30-2x equation: 



(S)=(40-2S)(30-2S

We move all terms to the left:

(S)-((40-2S)(30-2S)=0

We add all the numbers together, and all the variables

S-((-2S+40)(-2S+30)=0

We multiply parentheses ..

-((+4S^2-60S-80S+1200)+S=0

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