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=2D+8D-3
We move all terms to the left:
-(2D+8D-3)=0
We add all the numbers together, and all the variables
-(10D-3)=0
We get rid of parentheses
-10D+3=0
We move all terms containing D to the left, all other terms to the right
-10D=-3
D=-3/-10
D=3/10
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