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