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D in (-oo:+oo)
(D^12)/14 = 16 // - 16
(D^12)/14-16 = 0
1/14*D^12 = 16 // : 1/14
D^12 = 224
D^12 = 224 // ^ 1/12
abs(D) = 224^(1/12)
D = 224^(1/12) or D = -224^(1/12)
D in { 224^(1/12), -224^(1/12) }
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