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v in (-oo:+oo)
4/12 = v/9 // - v/9
4/12-(v/9) = 0
1/3-1/9*v = 0 // - 1/3
-1/9*v = -1/3 // : -1/9
v = -1/3/(-1/9)
v = 3
v = 3
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