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v in (-oo:+oo)
-2/7 = (-2/3)*v-(1/2) // - (-2/3)*v-(1/2)
1/2-((-2/3)*v)-2/7 = 0
(2/3)*v-2/7+1/2 = 0
2/3*v+3/14 = 0 // - 3/14
2/3*v = -3/14 // : 2/3
v = -3/14/2/3
v = -9/28
v = -9/28
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