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n in (-oo:+oo)
13*n = 1/5 // - 1/5
13*n-(1/5) = 0
13*n-1/5 = 0
13*n-1/5 = 0 // + 1/5
13*n = 1/5 // : 13
n = 1/5/13
n = 1/65
n = 1/65
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