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D( p )
p = 0
p^-1 = 0
p = 0
p = 0
p^-1 = 0
p^-1 = 0
1*p^-1 = 0 // : 1
p^-1 = 0
p należy do O
p in (-oo:0) U (0:+oo)
(7*p^5)/(p^-1) = 0
7*p^6 = 0 // : 7
p^6 = 0
p = 0
p in { 0}
p belongs to the empty set
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