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u in (-oo:+oo)
7/17 = u/8 // - u/8
7/17-(u/8) = 0
7/17-1/8*u = 0 // - 7/17
-1/8*u = -7/17 // : -1/8
u = -7/17/(-1/8)
u = 56/17
u = 56/17
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