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D( x )
x^9 = 0
x^9 = 0
x^9 = 0
1*x^9 = 0 // : 1
x^9 = 0
x = 0
x in (-oo:0) U (0:+oo)
(X^8)/(x^9) = 0
X^8*x^-9 = 0 // : X^8
x^-9 = 0
x należy do O
x belongs to the empty set
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