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4^x+2^(1+2x)=40
We move all terms to the left:
4^x+2^(1+2x)-(40)=0
We add all the numbers together, and all the variables
4^x+2^(2x+1)-40=0
We move all terms containing x to the left, all other terms to the right
4^x+2^(2x+1)=40
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