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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
-8/5 = 40/p // - 40/p
-(40/p)-8/5 = 0
-40*p^-1-8/5 = 0
-40*p^-1 = 8/5 // : -40
p^-1 = -1/25
-1 < 0
1/(p^1) = -1/25 // * p^1
1 = -1/25*p^1 // : -1/25
-25 = p^1
p = -25
p = -25
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