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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
4/p = 100 // - 100
4/p-100 = 0
4*p^-1 = 100 // : 4
p^-1 = 25
-1 < 0
1/(p^1) = 25 // * p^1
1 = 25*p^1 // : 25
1/25 = p^1
p = 1/25
p = 1/25
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