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Tìm $f\left ( x \right )  \mathbb{R}\rightarrow \mathbb{R}$ thỏa mãn

1, $f \left ( -\frac{4}{x+4} \right ) = -3f \left ( x \right )+2$

2,$ f \left ( -\frac{3x+4}{x+1} \right ) = -3f \left ( x \right )+2$