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81=3^4x+1
We move all terms to the left:
81-(3^4x+1)=0
We get rid of parentheses
-3^4x-1+81=0
We add all the numbers together, and all the variables
-3^4x+80=0
We move all terms containing x to the left, all other terms to the right
-3^4x=-80
x=-80/1
x=-80
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