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u in (-oo:+oo)
4/9 = 2*u // - 2*u
4/9-(2*u) = 0
4/9-2*u = 0
4/9-2*u = 0 // - 4/9
-2*u = -4/9 // : -2
u = -4/9/(-2)
u = 2/9
u = 2/9
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