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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
4 = 22/p // - 22/p
4-(22/p) = 0
4-22*p^-1 = 0
-22*p^-1 = -4 // : -22
p^-1 = 2/11
-1 < 0
1/(p^1) = 2/11 // * p^1
1 = 2/11*p^1 // : 2/11
11/2 = p^1
p = 11/2
p = 11/2
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