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=4-30A=2+20
We move all terms to the left:
-(4-30A)=0
We add all the numbers together, and all the variables
-(-30A+4)=0
We get rid of parentheses
30A-4=0
We move all terms containing A to the left, all other terms to the right
30A=4
A=4/30
A=2/15
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