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v in (-oo:+oo)
-1/5 = (2/3)*v-(1/2) // - (2/3)*v-(1/2)
1/2-((2/3)*v)-1/5 = 0
(-2/3)*v-1/5+1/2 = 0
3/10-2/3*v = 0 // - 3/10
-2/3*v = -3/10 // : -2/3
v = -3/10/(-2/3)
v = 9/20
v = 9/20
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