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v in (-oo:+oo)
-4/5-(7/5) = (-3/7)*v-((2/7)*v) // - (-3/7)*v-((2/7)*v)
(2/7)*v-((-3/7)*v)-4/5-(7/5) = 0
(3/7)*v+(2/7)*v-4/5-7/5 = 0
5/7*v-11/5 = 0 // + 11/5
5/7*v = 11/5 // : 5/7
v = 11/5/5/7
v = 77/25
v = 77/25
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