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4a-(a-9)=6
We move all terms to the left:
4a-(a-9)-(6)=0
We get rid of parentheses
4a-a+9-6=0
We add all the numbers together, and all the variables
3a+3=0
We move all terms containing a to the left, all other terms to the right
3a=-3
a=-3/3
a=-1
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