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**Question:**

\(\underset{x\to -\infty }{\mathop{\lim }}\,\frac{5x+2{{x}^{3}}}{{{x}^{3}}+x-7}\) = ?

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\(\underset{x\to -\infty }{\mathop{\lim }}\,\frac{5x+2{{x}^{3}}}{{{x}^{3}}+x-7}\) = ?

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