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v in (-oo:+oo)
(2/5)*v-((4/5)*v) = 2/5-6/5 // - 2/5-6/5
(2/5)*v-((4/5)*v)-(-6/5)-(2/5) = 0
(2/5)*v+(-4/5)*v+6/5-2/5 = 0
4/5-2/5*v = 0 // - 4/5
-2/5*v = -4/5 // : -2/5
v = -4/5/(-2/5)
v = 2
v = 2
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