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v in (-oo:+oo)
-((1/2)*v)-8/3 = -7/5 // + -7/5
-((1/2)*v)-8/3-(-7/5) = 0
(-1/2)*v-8/3+7/5 = 0
-1/2*v-19/15 = 0 // + 19/15
-1/2*v = 19/15 // : -1/2
v = 19/15/(-1/2)
v = -38/15
v = -38/15
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