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4^2x+2=4^2x-1+126
We move all terms to the left:
4^2x+2-(4^2x-1+126)=0
We get rid of parentheses
4^2x-4^2x+1-126+2=0
We add all the numbers together, and all the variables
4^2x-4^2x-123=0
We move all terms containing x to the left, all other terms to the right
4^2x-4^2x=123
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