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