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r in (-oo:+oo)
65416.6667 = 3.14*(4/3)*r^3 // - 3.14*(4/3)*r^3
65416.6667-(3.14*(4/3)*r^3) = 0
65416.6667-4.18666667*r^3 = 0
-4.18666667*r^3 = -65416.6667 // : -4.18666667
r^3 = 15624.99999552
r^3 = 15624.99999552 // ^ 1/3
r = 25
r = 25
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