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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
5/p = 3/11 // - 3/11
5/p-(3/11) = 0
5/p-3/11 = 0
5*p^-1 = 3/11 // : 5
p^-1 = 3/55
-1 < 0
1/(p^1) = 3/55 // * p^1
1 = 3/55*p^1 // : 3/55
55/3 = p^1
p = 55/3
p = 55/3
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