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v in (-oo:+oo)
(1/4)*v^2-(9/16) = 0
(1/4)*v^2-9/16 = 0
1/4*v^2 = 9/16 // : 1/4
v^2 = 9/4
v^2 = 9/4 // ^ 1/2
abs(v) = 3/2
v = 3/2 or v = -3/2
v in { 3/2, -3/2 }
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