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