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x in (-oo:+oo)
Y = (-1/6)*x^2 // - (-1/6)*x^2
Y-((-1/6)*x^2) = 0
Y+(1/6)*x^2 = 0
1/6*x^2 = -Y // : 1/6
x^2 = -6*Y
x^2 = -6*Y // ^ 1/2
abs(x) = (-6)^(1/2)*Y^(1/2)
x = (-6)^(1/2)*Y^(1/2) or x = -((-6)^(1/2)*Y^(1/2))
x in { (-6)^(1/2)*Y^(1/2), -((-6)^(1/2)*Y^(1/2)) }
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