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81=9x-6
We move all terms to the left:
81-(9x-6)=0
We get rid of parentheses
-9x+6+81=0
We add all the numbers together, and all the variables
-9x+87=0
We move all terms containing x to the left, all other terms to the right
-9x=-87
x=-87/-9
x=9+2/3
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