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v in (-oo:+oo)
(4/3)*v^2+(8/7)*v-6 = 0
4/3*v^2+8/7*v-6 = 0
DELTA = (8/7)^2-(-6*4/3*4)
DELTA = 1632/49
DELTA > 0
v = ((1632/49)^(1/2)-8/7)/(4/3*2) or v = (-(1632/49)^(1/2)-8/7)/(4/3*2)
v = 3/8*((1632/49)^(1/2)-8/7) or v = -3/8*((1632/49)^(1/2)+8/7)
v in { -3/8*((1632/49)^(1/2)+8/7), 3/8*((1632/49)^(1/2)-8/7) }
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