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v in (-oo:+oo)
14 = (-2/5)*v // - (-2/5)*v
14-((-2/5)*v) = 0
(2/5)*v+14 = 0
2/5*v+14 = 0 // - 14
2/5*v = -14 // : 2/5
v = -14/2/5
v = -35
v = -35
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