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u in (-oo:+oo)
(u-9)/2 = 4 // - 4
(u-9)/2-4 = 0
(u-9)/2+(-4*2)/2 = 0
u-4*2-9 = 0
u-17 = 0
(u-17)/2 = 0
(u-17)/2 = 0 // * 2
u-17 = 0
u-17 = 0 // + 17
u = 17
u = 17
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