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4(2a-4)=8
We move all terms to the left:
4(2a-4)-(8)=0
We multiply parentheses
8a-16-8=0
We add all the numbers together, and all the variables
8a-24=0
We move all terms containing a to the left, all other terms to the right
8a=24
a=24/8
a=3
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