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