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4a-16=a+4
We move all terms to the left:
4a-16-(a+4)=0
We get rid of parentheses
4a-a-4-16=0
We add all the numbers together, and all the variables
3a-20=0
We move all terms containing a to the left, all other terms to the right
3a=20
a=20/3
a=6+2/3
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