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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
5/p-1 = 8/11 // - 8/11
5/p-(8/11)-1 = 0
5/p-8/11-1 = 0
5*p^-1 = 19/11 // : 5
p^-1 = 19/55
-1 < 0
1/(p^1) = 19/55 // * p^1
1 = 19/55*p^1 // : 19/55
55/19 = p^1
p = 55/19
p = 55/19
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