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7a-12=a+24
We move all terms to the left:
7a-12-(a+24)=0
We get rid of parentheses
7a-a-24-12=0
We add all the numbers together, and all the variables
6a-36=0
We move all terms containing a to the left, all other terms to the right
6a=36
a=36/6
a=6
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