D=4000-400t

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Solution for D=4000-400t equation: 



=4000-400D

We move all terms to the left:

-(4000-400D)=0

We add all the numbers together, and all the variables

-(-400D+4000)=0

We get rid of parentheses

400D-4000=0

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

400D=4000

D=4000/400

D=10

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