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x in (-oo:+oo)
((X^3)/3)*x = -(((x^4)/9)*y^2) // + ((x^4)/9)*y^2
((X^3)/3)*x+((x^4)/9)*y^2 = 0
1/3*X^3*x+1/9*x^4*y^2 = 0
1/3*x*(X^3+1/3*x^3*y^2) = 0
1/3*x^3*y^2 = -X^3 // : 1/3*y^2
x^3 = 3*X^3*y^-2
x^3 = 3*X^3*y^-2 // ^ 1/3
x = 3^(1/3)*X*y^(-2/3)
x/3 = 0
1/3*x = 0 // : 1/3
x = 0
x in { 3^(1/3)*X*y^(-2/3), 0 }
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