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-9+3a=6a-2+5
We move all terms to the left:
-9+3a-(6a-2+5)=0
We add all the numbers together, and all the variables
3a-(6a+3)-9=0
We get rid of parentheses
3a-6a-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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