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v in (-oo:+oo)
25 = (-5/2)*v // - (-5/2)*v
25-((-5/2)*v) = 0
(5/2)*v+25 = 0
5/2*v+25 = 0 // - 25
5/2*v = -25 // : 5/2
v = -25/5/2
v = -10
v = -10
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