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