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v in (-oo:+oo)
40 = (5/2)*v // - (5/2)*v
40-((5/2)*v) = 0
(-5/2)*v+40 = 0
40-5/2*v = 0 // - 40
-5/2*v = -40 // : -5/2
v = -40/(-5/2)
v = 16
v = 16
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