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u in (-oo:+oo)
-6.7 = u/8+6.1 // - u/8+6.1
-(u/8)-6.7-6.1 = 0
-1/8*u-12.8 = 0 // + 12.8
-1/8*u = 12.8 // : -1/8
u = 12.8/(-1/8)
u = -102.4
u = -102.4
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