Find the following limits.
If necessary, select the most informative answer from \( \infty,-\infty \), and "Does Not Exist."
(a) \( \lim _{x \rightarrow-\infty} \frac{2-3 x^{3}}{2-3 x^{2}}=\square \)
(b) \( \lim _{x \rightarrow \infty} \frac{7-4 x}{5-7 x}=\square \) \( \square \)
Explanation
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