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v in (-oo:+oo)
30 = (5/2)*v // - (5/2)*v
30-((5/2)*v) = 0
(-5/2)*v+30 = 0
30-5/2*v = 0 // - 30
-5/2*v = -30 // : -5/2
v = -30/(-5/2)
v = 12
v = 12
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