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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
10/p = 8/9 // - 8/9
10/p-(8/9) = 0
10/p-8/9 = 0
10*p^-1 = 8/9 // : 10
p^-1 = 4/45
-1 < 0
1/(p^1) = 4/45 // * p^1
1 = 4/45*p^1 // : 4/45
45/4 = p^1
p = 45/4
p = 45/4
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