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(D)=2.5D
We move all terms to the left:
(D)-(2.5D)=0
We add all the numbers together, and all the variables
D-(+2.5D)=0
We get rid of parentheses
D-2.5D=0
We add all the numbers together, and all the variables
-1.5D=0
D=0/-1.5
D=0
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