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9x+81=23x-87
We move all terms to the left:
9x+81-(23x-87)=0
We get rid of parentheses
9x-23x+87+81=0
We add all the numbers together, and all the variables
-14x+168=0
We move all terms containing x to the left, all other terms to the right
-14x=-168
x=-168/-14
x=+12
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