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