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X in (-oo:+oo)
X/27 = 18/81 // - 18/81
X/27-(18/81) = 0
X/27-2/9 = 0
1/27*X-2/9 = 0 // + 2/9
1/27*X = 2/9 // : 1/27
X = 2/9/1/27
X = 6
X = 6
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