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n in (-oo:+oo)
8/9 = 2*n // - 2*n
8/9-(2*n) = 0
8/9-2*n = 0
8/9-2*n = 0 // - 8/9
-2*n = -8/9 // : -2
n = -8/9/(-2)
n = 4/9
n = 4/9
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