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v in (-oo:+oo)
v^2+(6/4)*v^2-(7*v)-4 = 0
v^2+(6/4)*v^2-7*v-4 = 0
5/2*v^2-7*v-4 = 0
DELTA = (-7)^2-(-4*5/2*4)
DELTA = 89
DELTA > 0
v = (89^(1/2)+7)/(2*5/2) or v = (7-89^(1/2))/(2*5/2)
v = (89^(1/2)+7)/5 or v = (7-89^(1/2))/5
v in { (7-89^(1/2))/5, (89^(1/2)+7)/5 }
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