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v in (-oo:+oo)
-1/5 = (-1/3)*v+1/5 // - (-1/3)*v+1/5
-((-1/3)*v)-1/5-(1/5) = 0
(1/3)*v-1/5-1/5 = 0
1/3*v-2/5 = 0 // + 2/5
1/3*v = 2/5 // : 1/3
v = 2/5/1/3
v = 6/5
v = 6/5
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