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=9A+819A+13
We move all terms to the left:
-(9A+819A+13)=0
We add all the numbers together, and all the variables
-(828A+13)=0
We get rid of parentheses
-828A-13=0
We move all terms containing A to the left, all other terms to the right
-828A=13
A=13/-828
A=-13/828
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