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x in (-oo:+oo)
x^3-(((2*x^2)/5)*x^3) = 0
(-2/5)*x^5+x^3 = 0
x^3-2/5*x^5 = 0
x^3*(1-2/5*x^2) = 0
-2/5*x^2 = -1 // : -2/5
x^2 = 5/2
x^2 = 5/2 // ^ 1/2
abs(x) = (5/2)^(1/2)
x = (5/2)^(1/2) or x = -(5/2)^(1/2)
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { (5/2)^(1/2), -(5/2)^(1/2), 0 }
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