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n in (-oo:+oo)
(n-5)/2 = 5 // - 5
(n-5)/2-5 = 0
(n-5)/2+(-5*2)/2 = 0
n-5*2-5 = 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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