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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
((5*p^-4)/7)*p^8 = 0
5/7*p^4 = 0 // : 5/7
p^4 = 0
p = 0
p in { 0}
p belongs to the empty set
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