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v in (-oo:+oo)
15 = (-3/2)*v // - (-3/2)*v
15-((-3/2)*v) = 0
(3/2)*v+15 = 0
3/2*v+15 = 0 // - 15
3/2*v = -15 // : 3/2
v = -15/3/2
v = -10
v = -10
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