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v in (-oo:+oo)
40 = (8/5)*v // - (8/5)*v
40-((8/5)*v) = 0
(-8/5)*v+40 = 0
40-8/5*v = 0 // - 40
-8/5*v = -40 // : -8/5
v = -40/(-8/5)
v = 25
v = 25
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