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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
12/p = 8/9 // - 8/9
12/p-(8/9) = 0
12/p-8/9 = 0
12*p^-1 = 8/9 // : 12
p^-1 = 2/27
-1 < 0
1/(p^1) = 2/27 // * p^1
1 = 2/27*p^1 // : 2/27
27/2 = p^1
p = 27/2
p = 27/2
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