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v in (-oo:+oo)
-3/7 = (1/2)*v-(2/3) // - (1/2)*v-(2/3)
2/3-((1/2)*v)-3/7 = 0
(-1/2)*v-3/7+2/3 = 0
5/21-1/2*v = 0 // - 5/21
-1/2*v = -5/21 // : -1/2
v = -5/21/(-1/2)
v = 10/21
v = 10/21
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