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v in (-oo:+oo)
-((1/2)*v)-2/3 = -8/7 // + -8/7
-((1/2)*v)-2/3-(-8/7) = 0
(-1/2)*v-2/3+8/7 = 0
10/21-1/2*v = 0 // - 10/21
-1/2*v = -10/21 // : -1/2
v = -10/21/(-1/2)
v = 20/21
v = 20/21
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