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=20+6A
We move all terms to the left:
-(20+6A)=0
We add all the numbers together, and all the variables
-(6A+20)=0
We get rid of parentheses
-6A-20=0
We move all terms containing A to the left, all other terms to the right
-6A=20
A=20/-6
A=-3+1/3
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