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	Các bình luận về: [VDC Câu 50 L2 &#8211; 2020] Có bao nhiêu số nguyên \(x\) sao cho tồn tại số thực \(y\) thỏa mãn \({\log _3}\left( {x + y} \right) = {\log _4}\left( {{x^2} + {y^2}} \right)\)?	</title>
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