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r in (-oo:+oo)
65.4167 = 3.14*(4/3)-r^3 // - 3.14*(4/3)-r^3
r^3-(3.14*(4/3))+65.4167 = 0
r^3-4.18666667+65.4167 = 0
1*r^3 = -61.23003333 // : 1
r^3 = -61.23003333
r^3 = -61.23003333 // ^ 1/3
r = -61.23003333^(1/3)
r = -61.23003333^(1/3)
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