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2a-4=8a-16
We move all terms to the left:
2a-4-(8a-16)=0
We get rid of parentheses
2a-8a+16-4=0
We add all the numbers together, and all the variables
-6a+12=0
We move all terms containing a to the left, all other terms to the right
-6a=-12
a=-12/-6
a=+2
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