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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
2/7 = 5/p // - 5/p
2/7-(5/p) = 0
2/7-5*p^-1 = 0
-5*p^-1 = -2/7 // : -5
p^-1 = 2/35
-1 < 0
1/(p^1) = 2/35 // * p^1
1 = 2/35*p^1 // : 2/35
35/2 = p^1
p = 35/2
p = 35/2
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