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9^x-(9^x-2)=240
We move all terms to the left:
9^x-(9^x-2)-(240)=0
We get rid of parentheses
9^x-9^x+2-240=0
We add all the numbers together, and all the variables
9^x-9^x-238=0
We move all terms containing x to the left, all other terms to the right
9^x-9^x=238
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