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u in (-oo:+oo)
11/13 = u/5 // - u/5
11/13-(u/5) = 0
11/13-1/5*u = 0 // - 11/13
-1/5*u = -11/13 // : -1/5
u = -11/13/(-1/5)
u = 55/13
u = 55/13
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