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x in (-oo:+oo)
((5*x^2)/3)*y-1 = 12 // - 12
((5*x^2)/3)*y-12-1 = 0
5/3*x^2*y = 13 // : 5/3*y
x^2 = 39/5*y^-1
x^2 = 39/5*y^-1 // ^ 1/2
abs(x) = (39/5)^(1/2)*y^(-1/2)
x = (39/5)^(1/2)*y^(-1/2) or x = -((39/5)^(1/2)*y^(-1/2))
x in { (39/5)^(1/2)*y^(-1/2), -((39/5)^(1/2)*y^(-1/2)) }
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