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u in (-oo:+oo)
11/8 = u/7 // - u/7
11/8-(u/7) = 0
11/8-1/7*u = 0 // - 11/8
-1/7*u = -11/8 // : -1/7
u = -11/8/(-1/7)
u = 77/8
u = 77/8
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