D=90-15t

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Solution for D=90-15t equation: 



=90-15D

We move all terms to the left:

-(90-15D)=0

We add all the numbers together, and all the variables

-(-15D+90)=0

We get rid of parentheses

15D-90=0

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

15D=90

D=90/15

D=6

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