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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)
(3/(x^5))/7 = 0
3/7*x^-5 = 0 // : 3/7
x^-5 = 0
x należy do O
x belongs to the empty set
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