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12a=4a-24
We move all terms to the left:
12a-(4a-24)=0
We get rid of parentheses
12a-4a+24=0
We add all the numbers together, and all the variables
8a+24=0
We move all terms containing a to the left, all other terms to the right
8a=-24
a=-24/8
a=-3
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