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n in (-oo:+oo)
(2*n)/3-(6/13) = 86/39 // - 86/39
(2*n)/3-(6/13)-(86/39) = 0
(2*n)/3-6/13-86/39 = 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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