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x in (-oo:+oo)
y = -((7/4)*x^2) // + (7/4)*x^2
(7/4)*x^2+y = 0
7/4*x^2 = -y // : 7/4
x^2 = -4/7*y
x^2 = -4/7*y // ^ 1/2
abs(x) = (-4/7)^(1/2)*y^(1/2)
x = (-4/7)^(1/2)*y^(1/2) or x = -((-4/7)^(1/2)*y^(1/2))
x in { (-4/7)^(1/2)*y^(1/2), -((-4/7)^(1/2)*y^(1/2)) }
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