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N in (-oo:+oo)
(N-1)/2 = 17 // - 17
(N-1)/2-17 = 0
(N-1)/2+(-17*2)/2 = 0
N-17*2-1 = 0
N-35 = 0
(N-35)/2 = 0
(N-35)/2 = 0 // * 2
N-35 = 0
N-35 = 0 // + 35
N = 35
N = 35
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