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X in (-oo:+oo)
3*X = 8/27 // - 8/27
3*X-(8/27) = 0
3*X-8/27 = 0
3*X-8/27 = 0 // + 8/27
3*X = 8/27 // : 3
X = 8/27/3
X = 8/81
X = 8/81
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