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Simplify

Algebra Level 2

Simplify $\dfrac{3^x+63}{21^{x-2}+7^{x-1}}$ .

\dfrac{9\times7}{7^x}

\dfrac{9\times49}{7^x}

\dfrac{3\times7}{7^x}

\dfrac{3}{7^x}

\dfrac{9}{7^x}

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by Khang Nguyen Thanh

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