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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
3/p-2 = -29 // + 29
3/p-2+29 = 0
3*p^-1 = -27 // : 3
p^-1 = -9
-1 < 0
1/(p^1) = -9 // * p^1
1 = -9*p^1 // : -9
-1/9 = p^1
p = -1/9
p = -1/9
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