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(15)=-200D+900
We move all terms to the left:
(15)-(-200D+900)=0
We get rid of parentheses
200D-900+15=0
We add all the numbers together, and all the variables
200D-885=0
We move all terms containing D to the left, all other terms to the right
200D=885
D=885/200
D=4+17/40
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