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6561=2^n-1
We move all terms to the left:
6561-(2^n-1)=0
We get rid of parentheses
-2^n+1+6561=0
We add all the numbers together, and all the variables
-2^n+6562=0
We move all terms containing n to the left, all other terms to the right
-2^n=-6562
n=-6562/1
n=-6562
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