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n in (-oo:+oo)
(n-1)/2 = 45 // - 45
(n-1)/2-45 = 0
(n-1)/2+(-45*2)/2 = 0
n-45*2-1 = 0
n-91 = 0
(n-91)/2 = 0
(n-91)/2 = 0 // * 2
n-91 = 0
n-91 = 0 // + 91
n = 91
n = 91
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