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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
4/p = 5/8 // - 5/8
4/p-(5/8) = 0
4/p-5/8 = 0
4*p^-1 = 5/8 // : 4
p^-1 = 5/32
-1 < 0
1/(p^1) = 5/32 // * p^1
1 = 5/32*p^1 // : 5/32
32/5 = p^1
p = 32/5
p = 32/5
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