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v in (-oo:+oo)
-((2/3)*v)-4/5 = -1/2 // + -1/2
-((2/3)*v)-4/5-(-1/2) = 0
(-2/3)*v-4/5+1/2 = 0
-2/3*v-3/10 = 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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