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D( p )
2*p = 0
2*p = 0
2*p = 0
2*p = 0 // : 2
p = 0
p in (-oo:0) U (0:+oo)
4/5-p = 12/(2*p) // - 12/(2*p)
4/5-p-(12/(2*p)) = 0
4/5-p-6*p^-1 = 0
4/5*p^0-1*p^1-6*p^-1 = 0
(4/5*p^1-1*p^2-6*p^0)/(p^1) = 0 // * p^2
p^1*(4/5*p^1-1*p^2-6*p^0) = 0
p^1
(4/5)*p-p^2-6 = 0
(4/5)*p-p^2-6 = 0
DELTA = (4/5)^2-(-6*(-1)*4)
DELTA = -584/25
DELTA < 0
p in { }
p belongs to the empty set
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