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18=8a+a
We move all terms to the left:
18-(8a+a)=0
We add all the numbers together, and all the variables
-(+9a)+18=0
We get rid of parentheses
-9a+18=0
We move all terms containing a to the left, all other terms to the right
-9a=-18
a=-18/-9
a=+2
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