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(6a-54)-(5a+27)=28
We move all terms to the left:
(6a-54)-(5a+27)-(28)=0
We get rid of parentheses
6a-5a-54-27-28=0
We add all the numbers together, and all the variables
a-109=0
We move all terms containing a to the left, all other terms to the right
a=109
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