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