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-8=13+2A
We move all terms to the left:
-8-(13+2A)=0
We add all the numbers together, and all the variables
-(2A+13)-8=0
We get rid of parentheses
-2A-13-8=0
We add all the numbers together, and all the variables
-2A-21=0
We move all terms containing A to the left, all other terms to the right
-2A=21
A=21/-2
A=-10+1/2
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