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X in (-oo:+oo)
2*X-(X/5) = 8 // - 8
2*X-(X/5)-8 = 0
9/5*X-8 = 0 // + 8
9/5*X = 8 // : 9/5
X = 8/9/5
X = 40/9
X = 40/9
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