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v in (-oo:+oo)
(5/3)*v-7 = -((4/5)*v)-(4/5) // + -((4/5)*v)-(4/5)
(5/3)*v+(4/5)*v+4/5-7 = 0
37/15*v-31/5 = 0 // + 31/5
37/15*v = 31/5 // : 37/15
v = 31/5/37/15
v = 93/37
v = 93/37
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