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-7x+81=2x+9
We move all terms to the left:
-7x+81-(2x+9)=0
We get rid of parentheses
-7x-2x-9+81=0
We add all the numbers together, and all the variables
-9x+72=0
We move all terms containing x to the left, all other terms to the right
-9x=-72
x=-72/-9
x=+8
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