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n in (-oo:+oo)
1/2-(2*n)-n = -1/2 // + -1/2
1/2-(2*n)-n-(-1/2) = 0
1/2-2*n-n+1/2 = 0
1-3*n = 0 // - 1
-3*n = -1 // : -3
n = -1/(-3)
n = 1/3
n = 1/3
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