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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
((2*p^-4)/3)*p^9 = 0
2/3*p^5 = 0 // : 2/3
p^5 = 0
p = 0
p in { 0}
p belongs to the empty set
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