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x in (-oo:+oo)
(-1/6)*x^3+2*x = 0
2*x-1/6*x^3 = 0
x*(2-1/6*x^2) = 0
-1/6*x^2 = -2 // : -1/6
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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