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23=2a+10-a
We move all terms to the left:
23-(2a+10-a)=0
We add all the numbers together, and all the variables
-(a+10)+23=0
We get rid of parentheses
-a-10+23=0
We add all the numbers together, and all the variables
-1a+13=0
We move all terms containing a to the left, all other terms to the right
-a=-13
a=-13/-1
a=+13
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