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