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