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9a+18=4a+48
We move all terms to the left:
9a+18-(4a+48)=0
We get rid of parentheses
9a-4a-48+18=0
We add all the numbers together, and all the variables
5a-30=0
We move all terms containing a to the left, all other terms to the right
5a=30
a=30/5
a=6
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