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