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