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X in (-oo:+oo)
X/18 = 18/81 // - 18/81
X/18-(18/81) = 0
X/18-2/9 = 0
1/18*X-2/9 = 0 // + 2/9
1/18*X = 2/9 // : 1/18
X = 2/9/1/18
X = 4
X = 4
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