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v in (-oo:+oo)
(-5/3)*v+(1/3)*v = 3/5-4/5 // - 3/5-4/5
(-5/3)*v+(1/3)*v-(-4/5)-(3/5) = 0
(-5/3)*v+(1/3)*v+4/5-3/5 = 0
1/5-4/3*v = 0 // - 1/5
-4/3*v = -1/5 // : -4/3
v = -1/5/(-4/3)
v = 3/20
v = 3/20
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