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