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V in (-oo:+oo)
V^2 = 81/100 // - 81/100
V^2-(81/100) = 0
V^2-81/100 = 0
1*V^2 = 81/100 // : 1
V^2 = 81/100
V^2 = 81/100 // ^ 1/2
abs(V) = 9/10
V = 9/10 or V = -9/10
V in { 9/10, -9/10 }
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