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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
(41/3)/p = 12/18 // - 12/18
(41/3)/p-(12/18) = 0
(41/3)/p-2/3 = 0
41/3*p^-1 = 2/3 // : 41/3
p^-1 = 2/41
-1 < 0
1/(p^1) = 2/41 // * p^1
1 = 2/41*p^1 // : 2/41
41/2 = p^1
p = 41/2
p = 41/2
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