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X in (-oo:+oo)
X-(8/3) = 2.3 // - 2.3
X-(8/3)-2.3 = 0
X-8/3-2.3 = 0
X-4.96666667 = 0 // + 4.96666667
X = 4.96666667
X = 4.96666667
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