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