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=42-28-A
We move all terms to the left:
-(42-28-A)=0
We add all the numbers together, and all the variables
-(-1A+14)=0
We get rid of parentheses
1A-14=0
We add all the numbers together, and all the variables
A-14=0
We move all terms containing A to the left, all other terms to the right
A=14
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