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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
(4/3)*v+5/v = 1 // - 1
(4/3)*v+5/v-1 = 0
4/3*v^1+5*v^-1-1*v^0 = 0
(4/3*v^2-1*v^1+5*v^0)/(v^1) = 0 // * v^2
v^1*(4/3*v^2-1*v^1+5*v^0) = 0
v^1
(4/3)*v^2-v+5 = 0
(4/3)*v^2-v+5 = 0
DELTA = (-1)^2-(4*5*(4/3))
DELTA = -77/3
DELTA < 0
v in { }
v belongs to the empty set
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