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v in (-oo:+oo)
50 = (5/2)*v // - (5/2)*v
50-((5/2)*v) = 0
(-5/2)*v+50 = 0
50-5/2*v = 0 // - 50
-5/2*v = -50 // : -5/2
v = -50/(-5/2)
v = 20
v = 20
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