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972=12^x-1
We move all terms to the left:
972-(12^x-1)=0
We get rid of parentheses
-12^x+1+972=0
We add all the numbers together, and all the variables
-12^x+973=0
We move all terms containing x to the left, all other terms to the right
-12^x=-973
x=-973/1
x=-973
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