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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
7/v = 4*v-((1/5)*v) // - 4*v-((1/5)*v)
(1/5)*v-(4*v)+7/v = 0
(1/5)*v-4*v+7/v = 0
7*v^-1-19/5*v^1 = 0
(7*v^0-19/5*v^2)/(v^1) = 0 // * v^2
v^1*(7*v^0-19/5*v^2) = 0
v^1
(-19/5)*v^2+7 = 0
(-19/5)*v^2+7 = 0
DELTA = 0^2-(4*7*(-19/5))
DELTA = 532/5
DELTA > 0
v = ((532/5)^(1/2)+0)/(2*(-19/5)) or v = (0-(532/5)^(1/2))/(2*(-19/5))
v = -5/38*(532/5)^(1/2) or v = 5/38*(532/5)^(1/2)
v in { -5/38*(532/5)^(1/2), 5/38*(532/5)^(1/2)}
v in { -5/38*(532/5)^(1/2), 5/38*(532/5)^(1/2) }
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