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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
v+v-(3/v)+8/v-8+3 = 0
v+v-3*v^-1+8/v-8+3 = 0
2*v^1+5*v^-1-5*v^0 = 0
(2*v^2-5*v^1+5*v^0)/(v^1) = 0 // * v^2
v^1*(2*v^2-5*v^1+5*v^0) = 0
v^1
2*v^2-5*v+5 = 0
2*v^2-5*v+5 = 0
DELTA = (-5)^2-(2*4*5)
DELTA = -15
DELTA < 0
v in { }
v belongs to the empty set
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