A.\(x \in \left\{ {\frac{2}{3}\,} \right\}\).
B.\(x \in \left\{ {\frac{2}{3};\,\,3} \right\}\).
C.\(x \in \left\{ {\frac{2}{3};\,\,1} \right\}\).
D.\(x \in \left\{ {\frac{2}{3};\,\,2} \right\}\).

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