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n in (-oo:+oo)
7*n = 2/5 // - 2/5
7*n-(2/5) = 0
7*n-2/5 = 0
7*n-2/5 = 0 // + 2/5
7*n = 2/5 // : 7
n = 2/5/7
n = 2/35
n = 2/35
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