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u in (-oo:+oo)
-15.9 = u/8-(3/1) // - u/8-(3/1)
3/1-(u/8)-15.9 = 0
3-(u/8)-15.9 = 0
-1/8*u-12.9 = 0 // + 12.9
-1/8*u = 12.9 // : -1/8
u = 12.9/(-1/8)
u = -103.2
u = -103.2
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