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18-3a=12a-2
We move all terms to the left:
18-3a-(12a-2)=0
We get rid of parentheses
-3a-12a+2+18=0
We add all the numbers together, and all the variables
-15a+20=0
We move all terms containing a to the left, all other terms to the right
-15a=-20
a=-20/-15
a=1+1/3
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