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U in (-oo:+oo)
8/3 = U/10 // - U/10
8/3-(U/10) = 0
8/3-1/10*U = 0 // - 8/3
-1/10*U = -8/3 // : -1/10
U = -8/3/(-1/10)
U = 80/3
U = 80/3
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