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n in (-oo:+oo)
2*n = 1/2 // - 1/2
2*n-(1/2) = 0
2*n-1/2 = 0
2*n-1/2 = 0 // + 1/2
2*n = 1/2 // : 2
n = 1/2/2
n = 1/4
n = 1/4
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