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v in (-oo:+oo)
(-1/2)*v-(6/5) = -2/3 // + -2/3
(-1/2)*v-(6/5)-(-2/3) = 0
(-1/2)*v-6/5+2/3 = 0
-1/2*v-8/15 = 0 // + 8/15
-1/2*v = 8/15 // : -1/2
v = 8/15/(-1/2)
v = -16/15
v = -16/15
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