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n in (-oo:+oo)
8*n = 2/5 // - 2/5
8*n-(2/5) = 0
8*n-2/5 = 0
8*n-2/5 = 0 // + 2/5
8*n = 2/5 // : 8
n = 2/5/8
n = 1/20
n = 1/20
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