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v in (-oo:+oo)
2-((v/8)*v)-(((3*v)/8)*v)+6 = 0
(-1/8)*v^2+(-3/8)*v^2+2+6 = 0
-1/2*v^2 = -8 // : -1/2
v^2 = 16
v^2 = 16 // ^ 1/2
abs(v) = 4
v = 4 or v = -4
v in { 4, -4 }
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