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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
7/p = 3/14 // - 3/14
7/p-(3/14) = 0
7/p-3/14 = 0
7*p^-1 = 3/14 // : 7
p^-1 = 3/98
-1 < 0
1/(p^1) = 3/98 // * p^1
1 = 3/98*p^1 // : 3/98
98/3 = p^1
p = 98/3
p = 98/3
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