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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
6/v+2 = (-7/2)*v+4+4 // - (-7/2)*v+4+4
6/v-((-7/2)*v)-4-4+2 = 0
(7/2)*v+6/v-4-4+2 = 0
7/2*v^1+6*v^-1-6*v^0 = 0
(7/2*v^2-6*v^1+6*v^0)/(v^1) = 0 // * v^2
v^1*(7/2*v^2-6*v^1+6*v^0) = 0
v^1
(7/2)*v^2-6*v+6 = 0
(7/2)*v^2-6*v+6 = 0
DELTA = (-6)^2-(4*6*(7/2))
DELTA = -48
DELTA < 0
v in { }
v belongs to the empty set
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