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x in (-oo:+oo)
V = 3.14*(4/3)*x^(3^3) // - 3.14*(4/3)*x^(3^3)
V-(3.14*(4/3)*x^(3^3)) = 0
V-4.18666667*x^(3^3) = 0
-4.18666667*x^27 = -V // : -4.18666667
x^27 = 0.2388535*V
x^27 = 0.2388535*V // ^ 1/27
x = 0.2388535^(1/27)*V^(1/27)
x = 0.2388535^(1/27)*V^(1/27)
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