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u in (-oo:+oo)
10.24 = u/8 // - u/8
10.24-(u/8) = 0
10.24-1/8*u = 0 // - 10.24
-1/8*u = -10.24 // : -1/8
u = -10.24/(-1/8)
u = 81.92
u = 81.92
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