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(D)=3D-4
We move all terms to the left:
(D)-(3D-4)=0
We get rid of parentheses
D-3D+4=0
We add all the numbers together, and all the variables
-2D+4=0
We move all terms containing D to the left, all other terms to the right
-2D=-4
D=-4/-2
D=+2
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