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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
1.8/3 = 2.4/p // - 2.4/p
1.8/3-(2.4/p) = 0
1.8/3-2.4*p^-1 = 0
-2.4*p^-1 = -0.6 // : -2.4
p^-1 = 0.25
-1 < 0
1/(p^1) = 0.25 // * p^1
1 = 0.25*p^1 // : 0.25
4 = p^1
p = 4
p = 4
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