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v in (-oo:+oo)
-1/3 = (1/2)*v-(3/5) // - (1/2)*v-(3/5)
3/5-((1/2)*v)-1/3 = 0
(-1/2)*v-1/3+3/5 = 0
4/15-1/2*v = 0 // - 4/15
-1/2*v = -4/15 // : -1/2
v = -4/15/(-1/2)
v = 8/15
v = 8/15
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