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v in (-oo:+oo)
15 = (-5/2)*v // - (-5/2)*v
15-((-5/2)*v) = 0
(5/2)*v+15 = 0
5/2*v+15 = 0 // - 15
5/2*v = -15 // : 5/2
v = -15/5/2
v = -6
v = -6
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