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r in (-oo:+oo)
(3.14*4*r^3)/3 = 195.3331 // - 195.3331
(3.14*4*r^3)/3-195.3331 = 0
4.18666667*r^3 = 195.3331 // : 4.18666667
r^3 = 46.65599519
r^3 = 46.65599519 // ^ 1/3
r = 46.65599519^(1/3)
r = 46.65599519^(1/3)
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