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-4+4a=8a+16
We move all terms to the left:
-4+4a-(8a+16)=0
We get rid of parentheses
4a-8a-16-4=0
We add all the numbers together, and all the variables
-4a-20=0
We move all terms containing a to the left, all other terms to the right
-4a=20
a=20/-4
a=-5
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