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