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v in (-oo:+oo)
2/3 = (-1/2)*v-(2/5) // - (-1/2)*v-(2/5)
2/3-((-1/2)*v)+2/5 = 0
(1/2)*v+2/3+2/5 = 0
1/2*v+16/15 = 0 // - 16/15
1/2*v = -16/15 // : 1/2
v = -16/15/1/2
v = -32/15
v = -32/15
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