\(\underset{x\to -\infty }{\mathop{\lim }}\,\frac{1-x}{3x+2}\)bằng
A. \(\frac{1}{3}\).                                               
B. \(\frac{1}{2}\).                                               
C. \(-\frac{1}{3}\).                                 
D. \(-\frac{1}{2}\).

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