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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
7/p = 9/2 // - 9/2
7/p-(9/2) = 0
7/p-9/2 = 0
7*p^-1 = 9/2 // : 7
p^-1 = 9/14
-1 < 0
1/(p^1) = 9/14 // * p^1
1 = 9/14*p^1 // : 9/14
14/9 = p^1
p = 14/9
p = 14/9
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