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