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82.80=13.6a+42
We move all terms to the left:
82.80-(13.6a+42)=0
We add all the numbers together, and all the variables
-(13.6a+42)+82.8=0
We get rid of parentheses
-13.6a-42+82.8=0
We add all the numbers together, and all the variables
-13.6a+40.8=0
We move all terms containing a to the left, all other terms to the right
-13.6a=-40.8
a=-40.8/-13.6
a=+3
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