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v in (-oo:+oo)
1/2 = (-1/3)*v-(2/5) // - (-1/3)*v-(2/5)
1/2-((-1/3)*v)+2/5 = 0
(1/3)*v+1/2+2/5 = 0
1/3*v+9/10 = 0 // - 9/10
1/3*v = -9/10 // : 1/3
v = -9/10/1/3
v = -27/10
v = -27/10
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