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9^x+4^x+2^x=8^x+6^x+1
We move all terms to the left:
9^x+4^x+2^x-(8^x+6^x+1)=0
We get rid of parentheses
9^x+4^x+2^x-8^x-6^x-1=0
We move all terms containing x to the left, all other terms to the right
9^x+4^x+2^x-8^x-6^x=1
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