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=-16^2+4D
We move all terms to the left:
-(-16^2+4D)=0
We get rid of parentheses
-4D+16^2=0
We add all the numbers together, and all the variables
-4D+256=0
We move all terms containing D to the left, all other terms to the right
-4D=-256
D=-256/-4
D=+64
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