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18-(2a-12)=8a-1
We move all terms to the left:
18-(2a-12)-(8a-1)=0
We get rid of parentheses
-2a-8a+12+1+18=0
We add all the numbers together, and all the variables
-10a+31=0
We move all terms containing a to the left, all other terms to the right
-10a=-31
a=-31/-10
a=3+1/10
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