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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
(6/7)*p^2-(2/p) = 0
(6/7)*p^2-2*p^-1 = 0
6/7*p^2-2*p^-1 = 0
2*p^-1*(3/7*p^3-1) = 0
3/7*p^3 = 1 // : 3/7
p^3 = 7/3
p^3 = 7/3 // ^ 1/3
p = (7/3)^(1/3)
2/p = 0
2*p^-1 = 0 // : 2
p^-1 = 0
p należy do O
p = (7/3)^(1/3)
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