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x in (-oo:+oo)
(1/9)*x^2*y-3 = 3 // - 3
(1/9)*x^2*y-3-3 = 0
1/9*x^2*y = 6 // : 1/9*y
x^2 = 54*y^-1
x^2 = 54*y^-1 // ^ 1/2
abs(x) = 3*6^(1/2)*y^(-1/2)
x = 3*6^(1/2)*y^(-1/2) or x = -(3*6^(1/2)*y^(-1/2))
x in { 3*6^(1/2)*y^(-1/2), -(3*6^(1/2)*y^(-1/2)) }
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