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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
5/p = 7/10 // - 7/10
5/p-(7/10) = 0
5/p-7/10 = 0
5*p^-1 = 7/10 // : 5
p^-1 = 7/50
-1 < 0
1/(p^1) = 7/50 // * p^1
1 = 7/50*p^1 // : 7/50
50/7 = p^1
p = 50/7
p = 50/7
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