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v in (-oo:+oo)
(1/2)*v-7 = (-4/3)*v-(7/3) // - (-4/3)*v-(7/3)
(1/2)*v-((-4/3)*v)+7/3-7 = 0
(1/2)*v+(4/3)*v+7/3-7 = 0
11/6*v-14/3 = 0 // + 14/3
11/6*v = 14/3 // : 11/6
v = 14/3/11/6
v = 28/11
v = 28/11
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