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-9+8a=5a-3+6
We move all terms to the left:
-9+8a-(5a-3+6)=0
We add all the numbers together, and all the variables
8a-(5a+3)-9=0
We get rid of parentheses
8a-5a-3-9=0
We add all the numbers together, and all the variables
3a-12=0
We move all terms containing a to the left, all other terms to the right
3a=12
a=12/3
a=4
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