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v in (-oo:+oo)
10 = (-5/7)*v // - (-5/7)*v
10-((-5/7)*v) = 0
(5/7)*v+10 = 0
5/7*v+10 = 0 // - 10
5/7*v = -10 // : 5/7
v = -10/5/7
v = -14
v = -14
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