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v in (-oo:+oo)
14 = (-2/3)*v // - (-2/3)*v
14-((-2/3)*v) = 0
(2/3)*v+14 = 0
2/3*v+14 = 0 // - 14
2/3*v = -14 // : 2/3
v = -14/2/3
v = -21
v = -21
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