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2(4a+3)+6(a+1)=54
We move all terms to the left:
2(4a+3)+6(a+1)-(54)=0
We multiply parentheses
8a+6a+6+6-54=0
We add all the numbers together, and all the variables
14a-42=0
We move all terms containing a to the left, all other terms to the right
14a=42
a=42/14
a=3
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