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x in (-oo:+oo)
y = (2/9)*x^2 // - (2/9)*x^2
y-((2/9)*x^2) = 0
(-2/9)*x^2+y = 0
-2/9*x^2 = -y // : -2/9
x^2 = 9/2*y
x^2 = 9/2*y // ^ 1/2
abs(x) = (9/2)^(1/2)*y^(1/2)
x = (9/2)^(1/2)*y^(1/2) or x = -((9/2)^(1/2)*y^(1/2))
x in { (9/2)^(1/2)*y^(1/2), -((9/2)^(1/2)*y^(1/2)) }
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