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u in (-oo:+oo)
11/3 = u/8 // - u/8
11/3-(u/8) = 0
11/3-1/8*u = 0 // - 11/3
-1/8*u = -11/3 // : -1/8
u = -11/3/(-1/8)
u = 88/3
u = 88/3
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