D(x)=3500-40x,S(x)=1700+5x

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Solution for D(x)=3500-40x,S(x)=1700+5x equation: 



(D)=3500-40D.(D)=1700+5D

We move all terms to the left:

(D)-(3500-40D.(D))=0

We add all the numbers together, and all the variables

D-(-40D.D+3500)=0

We get rid of parentheses

D+40D.D-3500=0

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

D+40D.D=3500

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