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18a-9=5a+2a-1=41-a
We move all terms to the left:
18a-9-(5a+2a-1)=0
We add all the numbers together, and all the variables
18a-(7a-1)-9=0
We get rid of parentheses
18a-7a+1-9=0
We add all the numbers together, and all the variables
11a-8=0
We move all terms containing a to the left, all other terms to the right
11a=8
a=8/11
a=8/11
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