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# GMAT Question of the Day - Problem Solving - Exponents

If m and z are integers and if ${{21}^{2m}}{{9}^{4m+2}}={{3}^{z}}{{7}^{4}}$, what is the value of m + z?

A. 8

B. 14

C. 20

D. 24

E. 26

Answer Show

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