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u in (-oo:+oo)
5/13 = u/9 // - u/9
5/13-(u/9) = 0
5/13-1/9*u = 0 // - 5/13
-1/9*u = -5/13 // : -1/9
u = -5/13/(-1/9)
u = 45/13
u = 45/13
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