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v in (-oo:+oo)
4 = (1/2)*v // - (1/2)*v
4-((1/2)*v) = 0
(-1/2)*v+4 = 0
4-1/2*v = 0 // - 4
-1/2*v = -4 // : -1/2
v = -4/(-1/2)
v = 8
v = 8
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