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x in (-oo:+oo)
y = (-1/640)*x^2 // - (-1/640)*x^2
y-((-1/640)*x^2) = 0
(1/640)*x^2+y = 0
1/640*x^2 = -y // : 1/640
x^2 = -640*y
x^2 = -640*y // ^ 1/2
abs(x) = (-640)^(1/2)*y^(1/2)
x = (-640)^(1/2)*y^(1/2) or x = -((-640)^(1/2)*y^(1/2))
x in { (-640)^(1/2)*y^(1/2), -((-640)^(1/2)*y^(1/2)) }
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