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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
-3.4/p = 0.06 // - 0.06
-3.4/p-0.06 = 0
-3.4*p^-1 = 0.06 // : -3.4
p^-1 = -0.01764706
-1 < 0
1/(p^1) = -0.01764706 // * p^1
1 = -0.01764706*p^1 // : -0.01764706
-56.66666289 = p^1
p = -56.66666289
p = -56.66666289
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