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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
4/p = 5/11 // - 5/11
4/p-(5/11) = 0
4/p-5/11 = 0
4*p^-1 = 5/11 // : 4
p^-1 = 5/44
-1 < 0
1/(p^1) = 5/44 // * p^1
1 = 5/44*p^1 // : 5/44
44/5 = p^1
p = 44/5
p = 44/5
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