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n in (-oo:+oo)
(14*n-7)/5 = 7 // - 7
(14*n-7)/5-7 = 0
(14*n-7)/5+(-7*5)/5 = 0
14*n-7*5-7 = 0
14*n-42 = 0
(14*n-42)/5 = 0
(14*n-42)/5 = 0 // * 5
14*n-42 = 0
14*n-42 = 0 // + 42
14*n = 42 // : 14
n = 42/14
n = 3
n = 3
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