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8a=4a+64
We move all terms to the left:
8a-(4a+64)=0
We get rid of parentheses
8a-4a-64=0
We add all the numbers together, and all the variables
4a-64=0
We move all terms containing a to the left, all other terms to the right
4a=64
a=64/4
a=16
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