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18=3a-6+a
We move all terms to the left:
18-(3a-6+a)=0
We add all the numbers together, and all the variables
-(4a-6)+18=0
We get rid of parentheses
-4a+6+18=0
We add all the numbers together, and all the variables
-4a+24=0
We move all terms containing a to the left, all other terms to the right
-4a=-24
a=-24/-4
a=+6
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