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(D)=-60D+450
We move all terms to the left:
(D)-(-60D+450)=0
We get rid of parentheses
D+60D-450=0
We add all the numbers together, and all the variables
61D-450=0
We move all terms containing D to the left, all other terms to the right
61D=450
D=450/61
D=7+23/61
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