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54(6^x)+3^x=6(18^x)+9
We move all terms to the left:
54(6^x)+3^x-(6(18^x)+9)=0
We get rid of parentheses
546^x+3^x-618^x-9=0
We move all terms containing x to the left, all other terms to the right
546^x+3^x-618^x=9
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