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n in (-oo:+oo)
(n+3)/3 = 24 // - 24
(n+3)/3-24 = 0
(n+3)/3+(-24*3)/3 = 0
n-24*3+3 = 0
n-69 = 0
(n-69)/3 = 0
(n-69)/3 = 0 // * 3
n-69 = 0
n-69 = 0 // + 69
n = 69
n = 69
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