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u in (-oo:+oo)
8/3 = 4*u // - 4*u
8/3-(4*u) = 0
8/3-4*u = 0
8/3-4*u = 0 // - 8/3
-4*u = -8/3 // : -4
u = -8/3/(-4)
u = 2/3
u = 2/3
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