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n in (-oo:+oo)
(n-7)/5 = 13 // - 13
(n-7)/5-13 = 0
(n-7)/5+(-13*5)/5 = 0
n-13*5-7 = 0
n-72 = 0
(n-72)/5 = 0
(n-72)/5 = 0 // * 5
n-72 = 0
n-72 = 0 // + 72
n = 72
n = 72
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