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x in (-oo:+oo)
y = (2/3)*x^2+3 // - (2/3)*x^2+3
y-((2/3)*x^2)-3 = 0
(-2/3)*x^2+y-3 = 0
-2/3*x^2 = -(y-3) // : -2/3
x^2 = -3/2*(3-y)
x^2 = -3/2*(3-y) // ^ 1/2
abs(x) = (-3/2)^(1/2)*(3-y)^(1/2)
x = (-3/2)^(1/2)*(3-y)^(1/2) or x = -((-3/2)^(1/2)*(3-y)^(1/2))
x in { (-3/2)^(1/2)*(3-y)^(1/2), -((-3/2)^(1/2)*(3-y)^(1/2)) }
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