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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
5/3 = 8/p // - 8/p
5/3-(8/p) = 0
5/3-8*p^-1 = 0
-8*p^-1 = -5/3 // : -8
p^-1 = 5/24
-1 < 0
1/(p^1) = 5/24 // * p^1
1 = 5/24*p^1 // : 5/24
24/5 = p^1
p = 24/5
p = 24/5
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