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v in (-oo:+oo)
42 = (7/6)*v // - (7/6)*v
42-((7/6)*v) = 0
(-7/6)*v+42 = 0
42-7/6*v = 0 // - 42
-7/6*v = -42 // : -7/6
v = -42/(-7/6)
v = 36
v = 36
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