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D( x )
x^7 = 0
x^7 = 0
x^7 = 0
1*x^7 = 0 // : 1
x^7 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^5*x^9)/(x^7) = 0
1*x^7 = 0 // : 1
x^7 = 0
x = 0
x in { 0}
x belongs to the empty set
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