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v in (-oo:+oo)
v^2 = 25/49 // - 25/49
v^2-(25/49) = 0
v^2-25/49 = 0
1*v^2 = 25/49 // : 1
v^2 = 25/49
v^2 = 25/49 // ^ 1/2
abs(v) = 5/7
v = 5/7 or v = -5/7
v in { 5/7, -5/7 }
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