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v in (-oo:+oo)
-((1/2)*v)-4/7 = -1/3 // + -1/3
-((1/2)*v)-4/7-(-1/3) = 0
(-1/2)*v-4/7+1/3 = 0
-1/2*v-5/21 = 0 // + 5/21
-1/2*v = 5/21 // : -1/2
v = 5/21/(-1/2)
v = -10/21
v = -10/21
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