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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
10/9 = 3/p // - 3/p
10/9-(3/p) = 0
10/9-3*p^-1 = 0
-3*p^-1 = -10/9 // : -3
p^-1 = 10/27
-1 < 0
1/(p^1) = 10/27 // * p^1
1 = 10/27*p^1 // : 10/27
27/10 = p^1
p = 27/10
p = 27/10
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