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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
-9/p-3 = 3/5 // - 3/5
-9/p-(3/5)-3 = 0
-9/p-3/5-3 = 0
-9*p^-1 = 18/5 // : -9
p^-1 = -2/5
-1 < 0
1/(p^1) = -2/5 // * p^1
1 = -2/5*p^1 // : -2/5
-5/2 = p^1
p = -5/2
p = -5/2
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