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v in (-oo:+oo)
-2/7-(6/7) = (-2/5)*v-((1/5)*v) // - (-2/5)*v-((1/5)*v)
(1/5)*v-((-2/5)*v)-2/7-(6/7) = 0
(2/5)*v+(1/5)*v-2/7-6/7 = 0
3/5*v-8/7 = 0 // + 8/7
3/5*v = 8/7 // : 3/5
v = 8/7/3/5
v = 40/21
v = 40/21
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