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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
3/p = 5/9 // - 5/9
3/p-(5/9) = 0
3/p-5/9 = 0
3*p^-1 = 5/9 // : 3
p^-1 = 5/27
-1 < 0
1/(p^1) = 5/27 // * p^1
1 = 5/27*p^1 // : 5/27
27/5 = p^1
p = 27/5
p = 27/5
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