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n in (-oo:+oo)
(2*n)/5-(3/13) = 37/65 // - 37/65
(2*n)/5-(3/13)-(37/65) = 0
(2*n)/5-3/13-37/65 = 0
2/5*n-4/5 = 0 // + 4/5
2/5*n = 4/5 // : 2/5
n = 4/5/2/5
n = 2
n = 2
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