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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
7/p = 6/13 // - 6/13
7/p-(6/13) = 0
7/p-6/13 = 0
7*p^-1 = 6/13 // : 7
p^-1 = 6/91
-1 < 0
1/(p^1) = 6/91 // * p^1
1 = 6/91*p^1 // : 6/91
91/6 = p^1
p = 91/6
p = 91/6
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