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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
3/20 = 2/p // - 2/p
3/20-(2/p) = 0
3/20-2*p^-1 = 0
-2*p^-1 = -3/20 // : -2
p^-1 = 3/40
-1 < 0
1/(p^1) = 3/40 // * p^1
1 = 3/40*p^1 // : 3/40
40/3 = p^1
p = 40/3
p = 40/3
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