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18-2a=a-3
We move all terms to the left:
18-2a-(a-3)=0
We get rid of parentheses
-2a-a+3+18=0
We add all the numbers together, and all the variables
-3a+21=0
We move all terms containing a to the left, all other terms to the right
-3a=-21
a=-21/-3
a=+7
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