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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
9/p = p/p-2 // - p/p-2
9/p-(p/p)+2 = 0
9/p-1+2 = 0
9*p^-1 = -1 // : 9
p^-1 = -1/9
-1 < 0
1/(p^1) = -1/9 // * p^1
1 = -1/9*p^1 // : -1/9
-9 = p^1
p = -9
p = -9
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