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v in (-oo:+oo)
-2/3 = (-1/2)*v-(4/5) // - (-1/2)*v-(4/5)
4/5-((-1/2)*v)-2/3 = 0
(1/2)*v-2/3+4/5 = 0
1/2*v+2/15 = 0 // - 2/15
1/2*v = -2/15 // : 1/2
v = -2/15/1/2
v = -4/15
v = -4/15
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