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r in (-oo:+oo)
17.1486 = 3.14*(4/3)*r^3 // - 3.14*(4/3)*r^3
17.1486-(3.14*(4/3)*r^3) = 0
17.1486-4.18666667*r^3 = 0
-4.18666667*r^3 = -17.1486 // : -4.18666667
r^3 = 4.09600318
r^3 = 4.09600318 // ^ 1/3
r = 4.09600318^(1/3)
r = 4.09600318^(1/3)
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