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9*y^2-((11/25)*x^2) = 0
(-11/25)*x^2+9*y^2 = 0
-11/25*x^2 = -(9*y^2) // : -11/25
x^2 = 225/11*y^2
x^2 = 225/11*y^2 // ^ 1/2
abs(x) = (225/11)^(1/2)*y
x = (225/11)^(1/2)*y or x = -((225/11)^(1/2)*y)
x in { (225/11)^(1/2)*y, -((225/11)^(1/2)*y) }
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