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D( p )
p^7 = 0
p^7 = 0
p^7 = 0
1*p^7 = 0 // : 1
p^7 = 0
p = 0
p in (-oo:0) U (0:+oo)
(p^8)/(p^7) = 0
p = 0
p in { 0}
p belongs to the empty set
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