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r in (-oo:+oo)
(r-5)/26 = -23 // + 23
(r-5)/26+23 = 0
(r-5)/26+(23*26)/26 = 0
r+23*26-5 = 0
r+593 = 0
(r+593)/26 = 0
(r+593)/26 = 0 // * 26
r+593 = 0
r+593 = 0 // - 593
r = -593
r = -593
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