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