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2^x+3=4^x-1
We move all terms to the left:
2^x+3-(4^x-1)=0
We get rid of parentheses
2^x-4^x+1+3=0
We add all the numbers together, and all the variables
2^x-4^x+4=0
We move all terms containing x to the left, all other terms to the right
2^x-4^x=-4
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