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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
4/p = 16/5 // - 16/5
4/p-(16/5) = 0
4/p-16/5 = 0
4*p^-1 = 16/5 // : 4
p^-1 = 4/5
-1 < 0
1/(p^1) = 4/5 // * p^1
1 = 4/5*p^1 // : 4/5
5/4 = p^1
p = 5/4
p = 5/4
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