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v in (-oo:+oo)
((1*v)/321)*v = 2 // - 2
((1*v)/321)*v-2 = 0
(v/321)*v-2 = 0
1/321*v^2 = 2 // : 1/321
v^2 = 642
v^2 = 642 // ^ 1/2
abs(v) = 642^(1/2)
v = 642^(1/2) or v = -642^(1/2)
v in { 642^(1/2), -642^(1/2) }
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