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v in (-oo:+oo)
(-2/5)*v+(5/4)*v = 3/2+4/3 // - 3/2+4/3
(-2/5)*v+(5/4)*v-(3/2)-(4/3) = 0
(-2/5)*v+(5/4)*v-3/2-4/3 = 0
17/20*v-17/6 = 0 // + 17/6
17/20*v = 17/6 // : 17/20
v = 17/6/17/20
v = 10/3
v = 10/3
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