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4^2x-7=7^x+3
We move all terms to the left:
4^2x-7-(7^x+3)=0
We get rid of parentheses
4^2x-7^x-3-7=0
We add all the numbers together, and all the variables
4^2x-7^x-10=0
We move all terms containing x to the left, all other terms to the right
4^2x-7^x=10
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