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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
8/p = 7/9 // - 7/9
8/p-(7/9) = 0
8/p-7/9 = 0
8*p^-1 = 7/9 // : 8
p^-1 = 7/72
-1 < 0
1/(p^1) = 7/72 // * p^1
1 = 7/72*p^1 // : 7/72
72/7 = p^1
p = 72/7
p = 72/7
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