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n in (-oo:+oo)
(n-97)/2 = 1 // - 1
(n-97)/2-1 = 0
(n-97)/2+(-1*2)/2 = 0
n-1*2-97 = 0
n-99 = 0
(n-99)/2 = 0
(n-99)/2 = 0 // * 2
n-99 = 0
n-99 = 0 // + 99
n = 99
n = 99
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