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v in (-oo:+oo)
-((1/3)*v)-2/5 = -(1/2) // + 1/2
1/2-((1/3)*v)-2/5 = 0
(-1/3)*v-2/5+1/2 = 0
1/10-1/3*v = 0 // - 1/10
-1/3*v = -1/10 // : -1/3
v = -1/10/(-1/3)
v = 3/10
v = 3/10
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