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2(4a+9)=34
We move all terms to the left:
2(4a+9)-(34)=0
We multiply parentheses
8a+18-34=0
We add all the numbers together, and all the variables
8a-16=0
We move all terms containing a to the left, all other terms to the right
8a=16
a=16/8
a=2
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