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v in (-oo:+oo)
-1/2 = (-1/5)*v-(4/3) // - (-1/5)*v-(4/3)
4/3-((-1/5)*v)-1/2 = 0
(1/5)*v-1/2+4/3 = 0
1/5*v+5/6 = 0 // - 5/6
1/5*v = -5/6 // : 1/5
v = -5/6/1/5
v = -25/6
v = -25/6
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