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-(x-23)=12
We move all terms to the left:
-(x-23)-(12)=0
We get rid of parentheses
-x+23-12=0
We add all the numbers together, and all the variables
-1x+11=0
We move all terms containing x to the left, all other terms to the right
-x=-11
x=-11/-1
x=+11
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