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v in (-oo:+oo)
8 = (-2/7)*v // - (-2/7)*v
8-((-2/7)*v) = 0
(2/7)*v+8 = 0
2/7*v+8 = 0 // - 8
2/7*v = -8 // : 2/7
v = -8/2/7
v = -28
v = -28
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