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v in (-oo:+oo)
(1/8)*v^2-6 = 0
1/8*v^2 = 6 // : 1/8
v^2 = 48
v^2 = 48 // ^ 1/2
abs(v) = 4*3^(1/2)
v = 4*3^(1/2) or v = -(4*3^(1/2))
v in { 4*3^(1/2), -(4*3^(1/2)) }
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