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u in (-oo:+oo)
u/13 = 11/3 // - 11/3
u/13-(11/3) = 0
u/13-11/3 = 0
1/13*u-11/3 = 0 // + 11/3
1/13*u = 11/3 // : 1/13
u = 11/3/1/13
u = 143/3
u = 143/3
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