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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
5/2*v+30 = 0 // - 30
5/2*v = -30 // : 5/2
v = -30/5/2
v = -12
v = -12
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