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X in (-oo:+oo)
X/9 = 8/12 // - 8/12
X/9-(8/12) = 0
X/9-2/3 = 0
1/9*X-2/3 = 0 // + 2/3
1/9*X = 2/3 // : 1/9
X = 2/3/1/9
X = 6
X = 6
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