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n in (-oo:+oo)
-2*n-(2/9) = -11/9 // + -11/9
-2*n-(2/9)-(-11/9) = 0
11/9-2*n-2/9 = 0
1-2*n = 0 // - 1
-2*n = -1 // : -2
n = -1/(-2)
n = 1/2
n = 1/2
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