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v in (-oo:+oo)
42 = (7/3)*v // - (7/3)*v
42-((7/3)*v) = 0
(-7/3)*v+42 = 0
42-7/3*v = 0 // - 42
-7/3*v = -42 // : -7/3
v = -42/(-7/3)
v = 18
v = 18
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