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