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6a+18=3a+27
We move all terms to the left:
6a+18-(3a+27)=0
We get rid of parentheses
6a-3a-27+18=0
We add all the numbers together, and all the variables
3a-9=0
We move all terms containing a to the left, all other terms to the right
3a=9
a=9/3
a=3
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