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D in (-oo:+oo)
0.156487 = (D^8)/3 // - (D^8)/3
0.156487-((D^8)/3) = 0
-1/3*D^8 = -0.156487 // : -1/3
D^8 = 0.469461
D^8 = 0.469461 // ^ 1/8
abs(D) = 0.469461^(1/8)
D = 0.469461^(1/8) or D = -0.469461^(1/8)
D in { 0.469461^(1/8), -0.469461^(1/8) }
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