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-23=2a-1-a
We move all terms to the left:
-23-(2a-1-a)=0
We add all the numbers together, and all the variables
-(a-1)-23=0
We get rid of parentheses
-a+1-23=0
We add all the numbers together, and all the variables
-1a-22=0
We move all terms containing a to the left, all other terms to the right
-a=22
a=22/-1
a=-22
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