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R in (-oo:+oo)
(R-8)/9 = 1 // - 1
(R-8)/9-1 = 0
(R-8)/9+(-1*9)/9 = 0
R-1*9-8 = 0
R-17 = 0
(R-17)/9 = 0
(R-17)/9 = 0 // * 9
R-17 = 0
R-17 = 0 // + 17
R = 17
R = 17
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