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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
4/p = 5/12 // - 5/12
4/p-(5/12) = 0
4/p-5/12 = 0
4*p^-1 = 5/12 // : 4
p^-1 = 5/48
-1 < 0
1/(p^1) = 5/48 // * p^1
1 = 5/48*p^1 // : 5/48
48/5 = p^1
p = 48/5
p = 48/5
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