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4^x-3=4^x-252
We move all terms to the left:
4^x-3-(4^x-252)=0
We get rid of parentheses
4^x-4^x+252-3=0
We add all the numbers together, and all the variables
4^x-4^x+249=0
We move all terms containing x to the left, all other terms to the right
4^x-4^x=-249
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