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x in (-oo:+oo)
(y^2)/144-((x^2)/25) = 1 // - 1
(y^2)/144-((x^2)/25)-1 = 0
-1/25*x^2 = -(1/144*y^2-1) // : -1/25
x^2 = -25*(1-(1/144*y^2))
x^2 = -25*(1-1/144*y^2) // ^ 1/2
abs(x) = (-25)^(1/2)*(1-1/144*y^2)^(1/2)
x = (-25)^(1/2)*(1-1/144*y^2)^(1/2) or x = -((-25)^(1/2)*(1-1/144*y^2)^(1/2))
x in { (-25)^(1/2)*(1-1/144*y^2)^(1/2), -((-25)^(1/2)*(1-1/144*y^2)^(1/2)) }
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