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d in (-oo:+oo)
(d^8)/3 = 6.77 // - 6.77
(d^8)/3-6.77 = 0
1/3*d^8 = 6.77 // : 1/3
d^8 = 20.3100002
d^8 = 20.3100002 // ^ 1/8
abs(d) = 20.3100002^(1/8)
d = 20.3100002^(1/8) or d = -20.3100002^(1/8)
d in { 20.3100002^(1/8), -20.3100002^(1/8) }
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