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u in (-oo:+oo)
-16/7 = 8*u // - 8*u
-(8*u)-16/7 = 0
-8*u-16/7 = 0
-8*u-16/7 = 0 // + 16/7
-8*u = 16/7 // : -8
u = 16/7/(-8)
u = -2/7
u = -2/7
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