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r in (-oo:+oo)
950 = 3.14*(4/3)*r^3 // - 3.14*(4/3)*r^3
950-(3.14*(4/3)*r^3) = 0
950-4.18666667*r^3 = 0
-4.18666667*r^3 = -950 // : -4.18666667
r^3 = 226.91082784
r^3 = 226.91082784 // ^ 1/3
r = 226.91082784^(1/3)
r = 226.91082784^(1/3)
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