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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
8/p = 5/14 // - 5/14
8/p-(5/14) = 0
8/p-5/14 = 0
8*p^-1 = 5/14 // : 8
p^-1 = 5/112
-1 < 0
1/(p^1) = 5/112 // * p^1
1 = 5/112*p^1 // : 5/112
112/5 = p^1
p = 112/5
p = 112/5
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