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D( x )
6*x^2 = 0
6*x^2 = 0
6*x^2 = 0
6*x^2 = 0 // : 6
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*y^2)/(6*x^2)-3 = 0
5/6*x^-2*y^2 = 3 // : 5/6*y^2
x^-2 = 18/5*y^-2
-2 < 0
1/(x^2) = 18/5*y^-2 // * x^2
1 = 18/5*x^2*y^-2 // : 18/5*y^-2
5/18*y^2 = x^2
x^2 = 5/18*y^2 // ^ 1/2
abs(x) = (5/18)^(1/2)*y
x = (5/18)^(1/2)*y or x = -((5/18)^(1/2)*y)
x in { (5/18)^(1/2)*y, -((5/18)^(1/2)*y) }
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