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v in (-oo:+oo)
(8/5)*v = 12/5 // - 12/5
(8/5)*v-(12/5) = 0
(8/5)*v-12/5 = 0
8/5*v-12/5 = 0 // + 12/5
8/5*v = 12/5 // : 8/5
v = 12/5/8/5
v = 3/2
v = 3/2
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