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12(2a+5)=108
We move all terms to the left:
12(2a+5)-(108)=0
We multiply parentheses
24a+60-108=0
We add all the numbers together, and all the variables
24a-48=0
We move all terms containing a to the left, all other terms to the right
24a=48
a=48/24
a=2
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