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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
(6/7)*v+1/v-1 = 0
6/7*v^1+1*v^-1-1*v^0 = 0
(6/7*v^2-1*v^1+1*v^0)/(v^1) = 0 // * v^2
v^1*(6/7*v^2-1*v^1+1*v^0) = 0
v^1
(6/7)*v^2-v+1 = 0
(6/7)*v^2-v+1 = 0
DELTA = (-1)^2-(1*4*(6/7))
DELTA = -17/7
DELTA < 0
v in { }
v belongs to the empty set
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