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n in (-oo:+oo)
(2*n-1)*(2/1-(2*n)) = 0
(2*n-1)*(2-2*n) = 0
( 2*n-1 )
2*n-1 = 0 // + 1
2*n = 1 // : 2
n = 1/2
( 2-2*n )
2-2*n = 0 // - 2
-2*n = -2 // : -2
n = -2/(-2)
n = 1
n in { 1/2, 1 }
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