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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
2.9/p = 0.55 // - 0.55
2.9/p-0.55 = 0
2.9*p^-1 = 0.55 // : 2.9
p^-1 = 0.18965517
-1 < 0
1/(p^1) = 0.18965517 // * p^1
1 = 0.18965517*p^1 // : 0.18965517
5.27272734 = p^1
p = 5.27272734
p = 5.27272734
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