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v in (-oo:+oo)
-((1/2)*v)-4/7 = -2/3 // + -2/3
-((1/2)*v)-4/7-(-2/3) = 0
(-1/2)*v-4/7+2/3 = 0
2/21-1/2*v = 0 // - 2/21
-1/2*v = -2/21 // : -1/2
v = -2/21/(-1/2)
v = 4/21
v = 4/21
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