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x in (-oo:+oo)
(4/5)*x^2-(6/y) = 0
(4/5)*x^2-6*y^-1 = 0
4/5*x^2 = -(-6*y^-1) // : 4/5
x^2 = 15/2*y^-1
x^2 = 15/2*y^-1 // ^ 1/2
abs(x) = (15/2)^(1/2)*y^(-1/2)
x = (15/2)^(1/2)*y^(-1/2) or x = -((15/2)^(1/2)*y^(-1/2))
x in { (15/2)^(1/2)*y^(-1/2), -((15/2)^(1/2)*y^(-1/2)) }
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