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8a-4(a+8)=8
We move all terms to the left:
8a-4(a+8)-(8)=0
We multiply parentheses
8a-4a-32-8=0
We add all the numbers together, and all the variables
4a-40=0
We move all terms containing a to the left, all other terms to the right
4a=40
a=40/4
a=10
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