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23+5a+12-a=5a-9+5a+6a
We move all terms to the left:
23+5a+12-a-(5a-9+5a+6a)=0
We add all the numbers together, and all the variables
5a-a-(16a-9)+23+12=0
We add all the numbers together, and all the variables
4a-(16a-9)+35=0
We get rid of parentheses
4a-16a+9+35=0
We add all the numbers together, and all the variables
-12a+44=0
We move all terms containing a to the left, all other terms to the right
-12a=-44
a=-44/-12
a=3+2/3
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