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u in (-oo:+oo)
5/7 = u/8 // - u/8
5/7-(u/8) = 0
5/7-1/8*u = 0 // - 5/7
-1/8*u = -5/7 // : -1/8
u = -5/7/(-1/8)
u = 40/7
u = 40/7
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