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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
4/p-(1/(-7)) = 17 // - 17
4/p-(1/(-7))-17 = 0
4/p+1/7-17 = 0
4*p^-1 = 118/7 // : 4
p^-1 = 59/14
-1 < 0
1/(p^1) = 59/14 // * p^1
1 = 59/14*p^1 // : 59/14
14/59 = p^1
p = 14/59
p = 14/59
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