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n in (-oo:+oo)
2*n = 5/25 // - 5/25
2*n-(5/25) = 0
2*n-1/5 = 0
2*n-1/5 = 0 // + 1/5
2*n = 1/5 // : 2
n = 1/5/2
n = 1/10
n = 1/10
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