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X in (-oo:+oo)
X/9 = 8/13 // - 8/13
X/9-(8/13) = 0
X/9-8/13 = 0
1/9*X-8/13 = 0 // + 8/13
1/9*X = 8/13 // : 1/9
X = 8/13/1/9
X = 72/13
X = 72/13
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