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n in (-oo:+oo)
(4/9)*n = 8/27 // - 8/27
(4/9)*n-(8/27) = 0
(4/9)*n-8/27 = 0
4/9*n-8/27 = 0 // + 8/27
4/9*n = 8/27 // : 4/9
n = 8/27/4/9
n = 2/3
n = 2/3
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