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v in (-oo:+oo)
(4/5)*v-1 = (-4/3)*v-(4/5) // - (-4/3)*v-(4/5)
(4/5)*v-((-4/3)*v)+4/5-1 = 0
(4/5)*v+(4/3)*v+4/5-1 = 0
32/15*v-1/5 = 0 // + 1/5
32/15*v = 1/5 // : 32/15
v = 1/5/32/15
v = 3/32
v = 3/32
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