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v in (-oo:+oo)
(-1/3)*v-(4/3) = 4*v+2/5 // - 4*v+2/5
(-1/3)*v-(4*v)-(4/3)-(2/5) = 0
(-1/3)*v-4*v-4/3-2/5 = 0
-13/3*v-26/15 = 0 // + 26/15
-13/3*v = 26/15 // : -13/3
v = 26/15/(-13/3)
v = -2/5
v = -2/5
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