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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
120/115 = 109.2/p // - 109.2/p
120/115-(109.2/p) = 0
120/115-109.2*p^-1 = 0
-109.2*p^-1 = -24/23 // : -109.2
p^-1 = 0.00955566
-1 < 0
1/(p^1) = 0.00955566 // * p^1
1 = 0.00955566*p^1 // : 0.00955566
104.65001894 = p^1
p = 104.65001894
p = 104.65001894
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