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-2=3A-8
We move all terms to the left:
-2-(3A-8)=0
We get rid of parentheses
-3A+8-2=0
We add all the numbers together, and all the variables
-3A+6=0
We move all terms containing A to the left, all other terms to the right
-3A=-6
A=-6/-3
A=+2
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