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v in (-oo:+oo)
-8 = (4/5)*v // - (4/5)*v
-((4/5)*v)-8 = 0
(-4/5)*v-8 = 0
-4/5*v-8 = 0 // + 8
-4/5*v = 8 // : -4/5
v = 8/(-4/5)
v = -10
v = -10
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