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V in (-oo:+oo)
V^2 = 25/81 // - 25/81
V^2-(25/81) = 0
V^2-25/81 = 0
1*V^2 = 25/81 // : 1
V^2 = 25/81
V^2 = 25/81 // ^ 1/2
abs(V) = 5/9
V = 5/9 or V = -5/9
V in { 5/9, -5/9 }
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