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x in (-oo:+oo)
Y = (1/6)*x^6 // - (1/6)*x^6
Y-((1/6)*x^6) = 0
Y+(-1/6)*x^6 = 0
-1/6*x^6 = -Y // : -1/6
x^6 = 6*Y
x^6 = 6*Y // ^ 1/6
abs(x) = 6^(1/6)*Y^(1/6)
x = 6^(1/6)*Y^(1/6) or x = -(6^(1/6)*Y^(1/6))
x in { 6^(1/6)*Y^(1/6), -(6^(1/6)*Y^(1/6)) }
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