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v in (-oo:+oo)
20 = (5/4)*v // - (5/4)*v
20-((5/4)*v) = 0
(-5/4)*v+20 = 0
20-5/4*v = 0 // - 20
-5/4*v = -20 // : -5/4
v = -20/(-5/4)
v = 16
v = 16
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