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	Các bình luận về: Cho \(0 \le x \le 2020\) và \({\log _9}(9x + 18) + x &#8211; 2y = {9^y}\).Có bao nhiêu cặp số \((x\,;y)\) nguyên thỏa mãn các điều kiện trên?	</title>
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