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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
12/p = 11/10 // - 11/10
12/p-(11/10) = 0
12/p-11/10 = 0
12*p^-1 = 11/10 // : 12
p^-1 = 11/120
-1 < 0
1/(p^1) = 11/120 // * p^1
1 = 11/120*p^1 // : 11/120
120/11 = p^1
p = 120/11
p = 120/11
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