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u in (-oo:+oo)
8/5 = 4*u // - 4*u
8/5-(4*u) = 0
8/5-4*u = 0
8/5-4*u = 0 // - 8/5
-4*u = -8/5 // : -4
u = -8/5/(-4)
u = 2/5
u = 2/5
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