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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
8/p = 4/9 // - 4/9
8/p-(4/9) = 0
8/p-4/9 = 0
8*p^-1 = 4/9 // : 8
p^-1 = 1/18
-1 < 0
1/(p^1) = 1/18 // * p^1
1 = 1/18*p^1 // : 1/18
18 = p^1
p = 18
p = 18
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