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x in (-oo:+oo)
X = (5/8)*x*x^2+33 // - (5/8)*x*x^2+33
X-((5/8)*x*x^2)-33 = 0
X+(-5/8)*x^3-33 = 0
-5/8*x^3 = -(X-33) // : -5/8
x^3 = -8/5*(33-X)
x^3 = -8/5*(33-X) // ^ 1/3
x = -(8/5)^(1/3)*(33-X)^(1/3)
x = -(8/5)^(1/3)*(33-X)^(1/3)
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