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