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