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n in (-oo:+oo)
(n-7)/2 = -11 // + 11
(n-7)/2+11 = 0
(n-7)/2+(2*11)/2 = 0
n+2*11-7 = 0
n+15 = 0
(n+15)/2 = 0
(n+15)/2 = 0 // * 2
n+15 = 0
n+15 = 0 // - 15
n = -15
n = -15
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