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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
9/p = 1 // - 1
9/p-1 = 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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