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=-16D^+196
We move all terms to the left:
-(-16D^+196)=0
We get rid of parentheses
16D^-196=0
We add all the numbers together, and all the variables
16D-196=0
We move all terms containing D to the left, all other terms to the right
16D=196
D=196/16
D=12+1/4
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