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3^x+3^x+3^x=3^4
We move all terms to the left:
3^x+3^x+3^x-(3^4)=0
We add all the numbers together, and all the variables
3^x+3^x+3^x-81=0
We move all terms containing x to the left, all other terms to the right
3^x+3^x+3^x=81
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