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u in (-oo:+oo)
u/12 = 6/9 // - 6/9
u/12-(6/9) = 0
u/12-2/3 = 0
1/12*u-2/3 = 0 // + 2/3
1/12*u = 2/3 // : 1/12
u = 2/3/1/12
u = 8
u = 8
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