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v in (-oo:+oo)
-3/2 = (-2/3)*v-(8/5) // - (-2/3)*v-(8/5)
8/5-((-2/3)*v)-3/2 = 0
(2/3)*v-3/2+8/5 = 0
2/3*v+1/10 = 0 // - 1/10
2/3*v = -1/10 // : 2/3
v = -1/10/2/3
v = -3/20
v = -3/20
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