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v in (-oo:+oo)
1 = (v^2)/22.5 // - (v^2)/22.5
1-((v^2)/22.5) = 0
1-0.04444444*v^2 = 0
-0.04444444*v^2 = -1 // : -0.04444444
v^2 = 22.50000225
v^2 = 22.50000225 // ^ 1/2
abs(v) = 22.50000225^(1/2)
v = 22.50000225^(1/2) or v = -22.50000225^(1/2)
v in { 22.50000225^(1/2), -22.50000225^(1/2) }
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