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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
4/p = 11/2 // - 11/2
4/p-(11/2) = 0
4/p-11/2 = 0
4*p^-1 = 11/2 // : 4
p^-1 = 11/8
-1 < 0
1/(p^1) = 11/8 // * p^1
1 = 11/8*p^1 // : 11/8
8/11 = p^1
p = 8/11
p = 8/11
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