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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
8/7-(6/p) = 3*p-((2/7)*p) // - 3*p-((2/7)*p)
(2/7)*p-(3*p)-(6/p)+8/7 = 0
(2/7)*p-3*p-6*p^-1+8/7 = 0
8/7*p^0-19/7*p^1-6*p^-1 = 0
(8/7*p^1-19/7*p^2-6*p^0)/(p^1) = 0 // * p^2
p^1*(8/7*p^1-19/7*p^2-6*p^0) = 0
p^1
(-19/7)*p^2+(8/7)*p-6 = 0
(-19/7)*p^2+(8/7)*p-6 = 0
DELTA = (8/7)^2-(-6*4*(-19/7))
DELTA = -3128/49
DELTA < 0
p in { }
p belongs to the empty set
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