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v in (-oo:+oo)
3 = ((1/2)*v^1)/2 // - ((1/2)*v^1)/2
3-(((1/2)*v^1)/2) = 0
(-1/4)*v+3 = 0
3-1/4*v = 0 // - 3
-1/4*v = -3 // : -1/4
v = -3/(-1/4)
v = 12
v = 12
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