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2(2a+2)=16
We move all terms to the left:
2(2a+2)-(16)=0
We multiply parentheses
4a+4-16=0
We add all the numbers together, and all the variables
4a-12=0
We move all terms containing a to the left, all other terms to the right
4a=12
a=12/4
a=3
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