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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
5/p = 3/9 // - 3/9
5/p-(3/9) = 0
5/p-1/3 = 0
5*p^-1 = 1/3 // : 5
p^-1 = 1/15
-1 < 0
1/(p^1) = 1/15 // * p^1
1 = 1/15*p^1 // : 1/15
15 = p^1
p = 15
p = 15
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