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n in (-oo:+oo)
(2*n)/3-(5/13) = 89/39 // - 89/39
(2*n)/3-(5/13)-(89/39) = 0
(2*n)/3-5/13-89/39 = 0
2/3*n-8/3 = 0 // + 8/3
2/3*n = 8/3 // : 2/3
n = 8/3/2/3
n = 4
n = 4
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