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n in (-oo:+oo)
n/9-(2/3) = n-2/9 // - n-2/9
n/9-n-(2/3)-(-2/9) = 0
n/9-n-2/3+2/9 = 0
-8/9*n-4/9 = 0 // + 4/9
-8/9*n = 4/9 // : -8/9
n = 4/9/(-8/9)
n = -1/2
n = -1/2
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