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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
2/p = (1/3)/2 // - (1/3)/2
2/p-((1/3)/2) = 0
2/p-1/6 = 0
2*p^-1 = 1/6 // : 2
p^-1 = 1/12
-1 < 0
1/(p^1) = 1/12 // * p^1
1 = 1/12*p^1 // : 1/12
12 = p^1
p = 12
p = 12
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