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u in (-oo:+oo)
17/11 = u/13 // - u/13
17/11-(u/13) = 0
17/11-1/13*u = 0 // - 17/11
-1/13*u = -17/11 // : -1/13
u = -17/11/(-1/13)
u = 221/11
u = 221/11
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