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D( x )
x^5 = 0
x^5 = 0
x^5 = 0
1*x^5 = 0 // : 1
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
y^0*((x^7*y^6)/(x^5)) = 0
(x^7*y^6)/(x^5) = 0
x^2*y^6 = 0 // : y^6
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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