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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
9/p = 5/4 // - 5/4
9/p-(5/4) = 0
9/p-5/4 = 0
9*p^-1 = 5/4 // : 9
p^-1 = 5/36
-1 < 0
1/(p^1) = 5/36 // * p^1
1 = 5/36*p^1 // : 5/36
36/5 = p^1
p = 36/5
p = 36/5
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