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r in (-oo:+oo)
25657.9322 = 3.14*(4/3)*r^3 // - 3.14*(4/3)*r^3
25657.9322-(3.14*(4/3)*r^3) = 0
25657.9322-4.18666667*r^3 = 0
-4.18666667*r^3 = -25657.9322 // : -4.18666667
r^3 = 6128.48698557
r^3 = 6128.48698557 // ^ 1/3
r = 6128.48698557^(1/3)
r = 6128.48698557^(1/3)
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