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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
56/p = 8/5 // - 8/5
56/p-(8/5) = 0
56/p-8/5 = 0
56*p^-1 = 8/5 // : 56
p^-1 = 1/35
-1 < 0
1/(p^1) = 1/35 // * p^1
1 = 1/35*p^1 // : 1/35
35 = p^1
p = 35
p = 35
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