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v in (-oo:+oo)
12 = (5*v)/2 // - (5*v)/2
12-((5*v)/2) = 0
(-5/2)*v+12 = 0
12-5/2*v = 0 // - 12
-5/2*v = -12 // : -5/2
v = -12/(-5/2)
v = 24/5
v = 24/5
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