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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
5/6 = 12/p // - 12/p
5/6-(12/p) = 0
5/6-12*p^-1 = 0
-12*p^-1 = -5/6 // : -12
p^-1 = 5/72
-1 < 0
1/(p^1) = 5/72 // * p^1
1 = 5/72*p^1 // : 5/72
72/5 = p^1
p = 72/5
p = 72/5
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