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v in (-oo:+oo)
(4/3)*v-(1/2) = -9/5 // + -9/5
(4/3)*v-(1/2)-(-9/5) = 0
(4/3)*v-1/2+9/5 = 0
4/3*v+13/10 = 0 // - 13/10
4/3*v = -13/10 // : 4/3
v = -13/10/4/3
v = -39/40
v = -39/40
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