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D( x )
x^6*z = 0
x^6*z = 0
x^6*z = 0
x^6*z = 0 // : z
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^7*z^5)/(x^6*z) = 0
x*z^4 = 0 // : z^4
x = 0
x in { 0}
x belongs to the empty set
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