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n in (-oo:+oo)
n/2+11/13 = 25/26 // - 25/26
n/2+11/13-(25/26) = 0
n/2+11/13-25/26 = 0
1/2*n-3/26 = 0 // + 3/26
1/2*n = 3/26 // : 1/2
n = 3/26/1/2
n = 3/13
n = 3/13
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