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X in (-oo:+oo)
X/18 = 6/9 // - 6/9
X/18-(6/9) = 0
X/18-2/3 = 0
1/18*X-2/3 = 0 // + 2/3
1/18*X = 2/3 // : 1/18
X = 2/3/1/18
X = 12
X = 12
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