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D( x )
((-2/3)*x^5*y^1)/3 = 0
((-2/3)*x^5*y^1)/3 = 0
((-2/3)*x^5*y^1)/3 = 0
((-2/3)*x^5*y)/3 = 0
-2/9*x^5*y = 0 // : -2/9*y
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((-2/3)*x^5*y^1)/3)^0 = 0
1 = 0
(((-2/3)*x^5*y^1)/3)^0 = 0
1 = 0
x belongs to the empty set
x belongs to the empty set
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