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v in (-oo:+oo)
1/4 = (-2/3)*v-(1/5) // - (-2/3)*v-(1/5)
1/4-((-2/3)*v)+1/5 = 0
(2/3)*v+1/4+1/5 = 0
2/3*v+9/20 = 0 // - 9/20
2/3*v = -9/20 // : 2/3
v = -9/20/2/3
v = -27/40
v = -27/40
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