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X in (-oo:+oo)
X/13 = 8/3 // - 8/3
X/13-(8/3) = 0
X/13-8/3 = 0
1/13*X-8/3 = 0 // + 8/3
1/13*X = 8/3 // : 1/13
X = 8/3/1/13
X = 104/3
X = 104/3
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