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538=a-108.
We move all terms to the left:
538-(a-108.)=0
We add all the numbers together, and all the variables
-(a-108)+538=0
We get rid of parentheses
-a+108+538=0
We add all the numbers together, and all the variables
-1a+646=0
We move all terms containing a to the left, all other terms to the right
-a=-646
a=-646/-1
a=+646
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