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v in (-oo:+oo)
4/5-v = (-1/2)*v-(2/5) // - (-1/2)*v-(2/5)
4/5-v-((-1/2)*v)+2/5 = 0
(1/2)*v-v+4/5+2/5 = 0
6/5-1/2*v = 0 // - 6/5
-1/2*v = -6/5 // : -1/2
v = -6/5/(-1/2)
v = 12/5
v = 12/5
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