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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
16/p = 128/40 // - 128/40
16/p-(128/40) = 0
16/p-16/5 = 0
16*p^-1 = 16/5 // : 16
p^-1 = 1/5
-1 < 0
1/(p^1) = 1/5 // * p^1
1 = 1/5*p^1 // : 1/5
5 = p^1
p = 5
p = 5
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