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x in (-oo:+oo)
x^2-((1/3)*x*x^3) = 0
(-1/3)*x^4+x^2 = 0
x^2-1/3*x^4 = 0
t_1 = x^2
1*t_1^1-1/3*t_1^2 = 0
t_1-1/3*t_1^2 = 0
DELTA = 1^2-(-1/3*0*4)
DELTA = 1
DELTA > 0
t_1 = (1^(1/2)-1)/(-1/3*2) or t_1 = (-1^(1/2)-1)/(-1/3*2)
t_1 = 0 or t_1 = 3
t_1 = 0
x^2+0 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
t_1 = 3
x^2-3 = 0
1*x^2 = 3 // : 1
x^2 = 3
x^2 = 3 // ^ 1/2
abs(x) = 3^(1/2)
x = 3^(1/2) or x = -3^(1/2)
x in { 0, 3^(1/2), -3^(1/2) }
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