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