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d in (-oo:+oo)
(d^4)/6 = 18 // - 18
(d^4)/6-18 = 0
1/6*d^4 = 18 // : 1/6
d^4 = 108
d^4 = 108 // ^ 1/4
abs(d) = 108^(1/4)
d = 108^(1/4) or d = -108^(1/4)
d in { 108^(1/4), -108^(1/4) }
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