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12a-24=12+9a
We move all terms to the left:
12a-24-(12+9a)=0
We add all the numbers together, and all the variables
12a-(9a+12)-24=0
We get rid of parentheses
12a-9a-12-24=0
We add all the numbers together, and all the variables
3a-36=0
We move all terms containing a to the left, all other terms to the right
3a=36
a=36/3
a=12
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