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