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