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X in (-oo:+oo)
X/9 = 84/108 // - 84/108
X/9-(84/108) = 0
X/9-7/9 = 0
1/9*X-7/9 = 0 // + 7/9
1/9*X = 7/9 // : 1/9
X = 7/9/1/9
X = 7
X = 7
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