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v in (-oo:+oo)
13 = (-1/6)*v // - (-1/6)*v
13-((-1/6)*v) = 0
(1/6)*v+13 = 0
1/6*v+13 = 0 // - 13
1/6*v = -13 // : 1/6
v = -13/1/6
v = -78
v = -78
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