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x in (-oo:+oo)
v = 2*3.14*(1/3)*x*(3*x)^2 // - 2*3.14*(1/3)*x*(3*x)^2
v-(2*3.14*(1/3)*x*(3*x)^2) = 0
v-2.09333333*x*(3*x)^2 = 0
-18.83999997*x^3 = -v // : -18.83999997
x^3 = 0.05307856*v
x^3 = 0.05307856*v // ^ 1/3
x = 0.05307856^(1/3)*v^(1/3)
x = 0.05307856^(1/3)*v^(1/3)
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