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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
(1/6)*c+7/c-(c/c)-4+1+3 = 0
(1/6)*c+7/c-4-1+1+3 = 0
1/6*c^1+7*c^-1-1*c^0 = 0
(1/6*c^2-1*c^1+7*c^0)/(c^1) = 0 // * c^2
c^1*(1/6*c^2-1*c^1+7*c^0) = 0
c^1
(1/6)*c^2-c+7 = 0
(1/6)*c^2-c+7 = 0
DELTA = (-1)^2-(4*7*(1/6))
DELTA = -11/3
DELTA < 0
c in { }
c belongs to the empty set
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