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d in (-oo:+oo)
(1.570796327*d^2*(0.5*d)^2)/3 = 55.7 // - 55.7
(1.570796327*d^2*(0.5*d)^2)/3-55.7 = 0
0.52359878*0.5^2*d^4 = 55.7 // : 0.52359878*0.5^2
d^4 = 106.37916307*0.5^-2
d^4 = 425.51665228 // ^ 1/4
abs(d) = 425.51665228^(1/4)
d = 425.51665228^(1/4) or d = -425.51665228^(1/4)
d in { 425.51665228^(1/4), -425.51665228^(1/4) }
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