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v in (-oo:+oo)
12/7 = 6*v // - 6*v
12/7-(6*v) = 0
12/7-6*v = 0
12/7-6*v = 0 // - 12/7
-6*v = -12/7 // : -6
v = -12/7/(-6)
v = 2/7
v = 2/7
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