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v in (-oo:+oo)
-1/2 = (5/6)*v-(2/5) // - (5/6)*v-(2/5)
2/5-((5/6)*v)-1/2 = 0
(-5/6)*v-1/2+2/5 = 0
-5/6*v-1/10 = 0 // + 1/10
-5/6*v = 1/10 // : -5/6
v = 1/10/(-5/6)
v = -3/25
v = -3/25
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