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