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7^2x+1=3^x+3
We move all terms to the left:
7^2x+1-(3^x+3)=0
We get rid of parentheses
7^2x-3^x-3+1=0
We add all the numbers together, and all the variables
7^2x-3^x-2=0
We move all terms containing x to the left, all other terms to the right
7^2x-3^x=2
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