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v in (-oo:+oo)
14 = (2/7)*v // - (2/7)*v
14-((2/7)*v) = 0
(-2/7)*v+14 = 0
14-2/7*v = 0 // - 14
-2/7*v = -14 // : -2/7
v = -14/(-2/7)
v = 49
v = 49
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