D(t)=-200(t)+9000

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Solution for D(t)=-200(t)+9000 equation: 



(D)=-200(D)+9000

We move all terms to the left:

(D)-(-200(D)+9000)=0

We get rid of parentheses

D+200D-9000=0

We add all the numbers together, and all the variables

201D-9000=0

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

201D=9000

D=9000/201

D=44+52/67

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