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