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u in (-oo:+oo)
-9.2 = u/8+16.4 // - u/8+16.4
-(u/8)-16.4-9.2 = 0
-1/8*u-25.6 = 0 // + 25.6
-1/8*u = 25.6 // : -1/8
u = 25.6/(-1/8)
u = -204.8
u = -204.8
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