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v in (-oo:+oo)
16/39-v^2 = 0
-1*v^2 = -16/39 // : -1
v^2 = 16/39
v^2 = 16/39 // ^ 1/2
abs(v) = (16/39)^(1/2)
v = (16/39)^(1/2) or v = -(16/39)^(1/2)
v in { (16/39)^(1/2), -(16/39)^(1/2) }
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