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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
v-(3*v)-((10/5)*v)-(8/v) = 0
v-3*v-2*v-8*v^-1 = 0
-4*v^1-8*v^-1 = 0
(-4*v^2-8*v^0)/(v^1) = 0 // * v^2
v^1*(-4*v^2-8*v^0) = 0
v^1
-4*v^2-8 = 0
-4*v^2-8 = 0
DELTA = 0^2-(-8*(-4)*4)
DELTA = -128
DELTA < 0
v in { }
v belongs to the empty set
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