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