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