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n in (-oo:+oo)
(1/2)*n = 8/9 // - 8/9
(1/2)*n-(8/9) = 0
(1/2)*n-8/9 = 0
1/2*n-8/9 = 0 // + 8/9
1/2*n = 8/9 // : 1/2
n = 8/9/1/2
n = 16/9
n = 16/9
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