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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
30/p = 5 // - 5
30/p-5 = 0
30*p^-1 = 5 // : 30
p^-1 = 1/6
-1 < 0
1/(p^1) = 1/6 // * p^1
1 = 1/6*p^1 // : 1/6
6 = p^1
p = 6
p = 6
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