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x in (-oo:+oo)
(x^2)/(5^2)-((y^2)/(6^2)) = 0
1/25*x^2 = -(-1/36*y^2) // : 1/25
x^2 = 25/36*y^2
x^2 = 25/36*y^2 // ^ 1/2
abs(x) = 5/6*y
x = 5/6*y or x = -(5/6*y)
x in { 5/6*y, -(5/6*y) }
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