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u in (-oo:+oo)
4*u = 8/9 // - 8/9
4*u-(8/9) = 0
4*u-8/9 = 0
4*u-8/9 = 0 // + 8/9
4*u = 8/9 // : 4
u = 8/9/4
u = 2/9
u = 2/9
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