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(x^3)/3-(4*x) = 0
(x^3)/3-4*x = 0
1/3*x^3-4*x = 0
x*(1/3*x^2-4) = 0
1/3*x^2 = 4 // : 1/3
x^2 = 12
x^2 = 12 // ^ 1/2
abs(x) = 2*3^(1/2)
x = 2*3^(1/2) or x = -(2*3^(1/2))
x = 0
x = 0
x in { 2*3^(1/2), -(2*3^(1/2)), 0 }
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