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