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n in (-oo:+oo)
(10/13)*n = 30/39 // - 30/39
(10/13)*n-(30/39) = 0
(10/13)*n-10/13 = 0
10/13*n-10/13 = 0 // + 10/13
10/13*n = 10/13 // : 10/13
n = 10/13/10/13
n = 1
n = 1
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