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8a=2a+4
We move all terms to the left:
8a-(2a+4)=0
We get rid of parentheses
8a-2a-4=0
We add all the numbers together, and all the variables
6a-4=0
We move all terms containing a to the left, all other terms to the right
6a=4
a=4/6
a=2/3
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