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n in (-oo:+oo)
n-((3/8)*n) = 13 // - 13
n-((3/8)*n)-13 = 0
n+(-3/8)*n-13 = 0
5/8*n-13 = 0 // + 13
5/8*n = 13 // : 5/8
n = 13/5/8
n = 104/5
n = 104/5
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