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x in (-oo:+oo)
(1/4)*x^3-(3*x) = 0
(1/4)*x^3-3*x = 0
1/4*x^3-3*x = 0
x*(1/4*x^2-3) = 0
1/4*x^2 = 3 // : 1/4
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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