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a-12+a+18=a+48
We move all terms to the left:
a-12+a+18-(a+48)=0
We add all the numbers together, and all the variables
2a-(a+48)+6=0
We get rid of parentheses
2a-a-48+6=0
We add all the numbers together, and all the variables
a-42=0
We move all terms containing a to the left, all other terms to the right
a=42
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