4^x^2-21=16^2x

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Solution for 4^x^2-21=16^2x equation: 



4^x^2-21=16^2x

We move all terms to the left:

4^x^2-21-(16^2x)=0

We move all terms containing x to the left, all other terms to the right

4^x^2-16^2x=21

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