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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
19/p = 16/36 // - 16/36
19/p-(16/36) = 0
19/p-4/9 = 0
19*p^-1 = 4/9 // : 19
p^-1 = 4/171
-1 < 0
1/(p^1) = 4/171 // * p^1
1 = 4/171*p^1 // : 4/171
171/4 = p^1
p = 171/4
p = 171/4
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