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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
3/p = 4/13 // - 4/13
3/p-(4/13) = 0
3/p-4/13 = 0
3*p^-1 = 4/13 // : 3
p^-1 = 4/39
-1 < 0
1/(p^1) = 4/39 // * p^1
1 = 4/39*p^1 // : 4/39
39/4 = p^1
p = 39/4
p = 39/4
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