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6^(8-x)=(1)/(216)
We move all terms to the left:
6^(8-x)-((1)/(216))=0
We add all the numbers together, and all the variables
6^(-1x+8)-(+1/216)=0
We get rid of parentheses
6^(-1x+8)-1/216=0
We multiply all the terms by the denominator
(6^(-1x+8))*216-1=0
We move all terms containing x to the left, all other terms to the right
(6^(-1x+8))*216=1
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