D(x)=800-10x

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Solution for D(x)=800-10x equation: 



(D)=800-10D

We move all terms to the left:

(D)-(800-10D)=0

We add all the numbers together, and all the variables

D-(-10D+800)=0

We get rid of parentheses

D+10D-800=0

We add all the numbers together, and all the variables

11D-800=0

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

11D=800

D=800/11

D=72+8/11

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