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limn→∞5n+1+7n+15n−1−7n−1=?\large\lim_{n\to \infty} \dfrac{5^{n+1}+7^{n+1}}{5^{n-1}-7^{n-1}}=?n→∞lim5n−1−7n−15n+1+7n+1=?
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