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n in (-oo:+oo)
5*n = 5/8 // - 5/8
5*n-(5/8) = 0
5*n-5/8 = 0
5*n-5/8 = 0 // + 5/8
5*n = 5/8 // : 5
n = 5/8/5
n = 1/8
n = 1/8
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