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5^x-(5)^(3-x)=20
We move all terms to the left:
5^x-(5)^(3-x)-(20)=0
We add all the numbers together, and all the variables
5^x-5^(-1x+3)-20=0
We move all terms containing x to the left, all other terms to the right
5^x-5^(-1x+3)=20
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