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v in (-oo:+oo)
1/2 = (-1/2)*v-(4/7) // - (-1/2)*v-(4/7)
1/2-((-1/2)*v)+4/7 = 0
(1/2)*v+1/2+4/7 = 0
1/2*v+15/14 = 0 // - 15/14
1/2*v = -15/14 // : 1/2
v = -15/14/1/2
v = -15/7
v = -15/7
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