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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
9/(-15) = 27/p // - 27/p
9/(-15)-(27/p) = 0
9/(-15)-27*p^-1 = 0
-27*p^-1 = 3/5 // : -27
p^-1 = -1/45
-1 < 0
1/(p^1) = -1/45 // * p^1
1 = -1/45*p^1 // : -1/45
-45 = p^1
p = -45
p = -45
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