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