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u in (-oo:+oo)
11/13 = u/4 // - u/4
11/13-(u/4) = 0
11/13-1/4*u = 0 // - 11/13
-1/4*u = -11/13 // : -1/4
u = -11/13/(-1/4)
u = 44/13
u = 44/13
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