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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
7/p = 6/11 // - 6/11
7/p-(6/11) = 0
7/p-6/11 = 0
7*p^-1 = 6/11 // : 7
p^-1 = 6/77
-1 < 0
1/(p^1) = 6/77 // * p^1
1 = 6/77*p^1 // : 6/77
77/6 = p^1
p = 77/6
p = 77/6
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