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52=-9+16D-19
We move all terms to the left:
52-(-9+16D-19)=0
We add all the numbers together, and all the variables
-(16D-28)+52=0
We get rid of parentheses
-16D+28+52=0
We add all the numbers together, and all the variables
-16D+80=0
We move all terms containing D to the left, all other terms to the right
-16D=-80
D=-80/-16
D=+5
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