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u in (-oo:+oo)
7/8 = u/9 // - u/9
7/8-(u/9) = 0
7/8-1/9*u = 0 // - 7/8
-1/9*u = -7/8 // : -1/9
u = -7/8/(-1/9)
u = 63/8
u = 63/8
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