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D( x )
5*x^5 = 0
5*x^5 = 0
5*x^5 = 0
5*x^5 = 0 // : 5
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
((2*x^8*y^6)/(5*x^5))*y^3 = 0
2/5*x^3*y^9 = 0 // : 2/5*y^9
x^3 = 0
x = 0
x in { 0}
x belongs to the empty set
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