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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)
((2*x^2)/(x^9))^3 = 0
8*x^-21 = 0 // : 8
x^-21 = 0
x należy do O
x belongs to the empty set
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