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v in (-oo:+oo)
2/3 = (-1/2)*v-(1/7) // - (-1/2)*v-(1/7)
2/3-((-1/2)*v)+1/7 = 0
(1/2)*v+2/3+1/7 = 0
1/2*v+17/21 = 0 // - 17/21
1/2*v = -17/21 // : 1/2
v = -17/21/1/2
v = -34/21
v = -34/21
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