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n in (-oo:+oo)
15*n = 6/13 // - 6/13
15*n-(6/13) = 0
15*n-6/13 = 0
15*n-6/13 = 0 // + 6/13
15*n = 6/13 // : 15
n = 6/13/15
n = 2/65
n = 2/65
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