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x in (-oo:+oo)
((X^3)/2)*x^2-8 = 0
1/2*X^3*x^2 = 8 // : 1/2*X^3
x^2 = 16*X^-3
x^2 = 16*X^-3 // ^ 1/2
abs(x) = 4*X^(-3/2)
x = 4*X^(-3/2) or x = -(4*X^(-3/2))
x in { 4*X^(-3/2), -(4*X^(-3/2)) }
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