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	Các bình luận về: Đồ thị hàm số $y=\dfrac{4 x^{2} &#8211; 7 x &#8211; 4}{x + 6}$ có tâm đối xứng là $I(h;k)$. Giá trị của biểu thức $P=h+2k$ bằng	</title>
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