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v in (-oo:+oo)
(8/5)*(v+6) = 3/5-v // - 3/5-v
(8/5)*(v+6)+v-(3/5) = 0
(8/5)*(v+6)+v-3/5 = 0
8/5*(v+6)+v-3/5 = 0
(8/5*5*(v+6))/5+(5*v)/5-3/5 = 0
8/5*5*(v+6)+5*v-3 = 0
13*v-3+48 = 0
13*v+45 = 0
(13*v+45)/5 = 0
(13*v+45)/5 = 0 // * 5
13*v+45 = 0
13*v+45 = 0 // - 45
13*v = -45 // : 13
v = -45/13
v = -45/13
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