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n in (-oo:+oo)
(4*n)/5-(7/13) = 69/65 // - 69/65
(4*n)/5-(7/13)-(69/65) = 0
(4*n)/5-7/13-69/65 = 0
4/5*n-8/5 = 0 // + 8/5
4/5*n = 8/5 // : 4/5
n = 8/5/4/5
n = 2
n = 2
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