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11a+18-3a=9a+6+a
We move all terms to the left:
11a+18-3a-(9a+6+a)=0
We add all the numbers together, and all the variables
11a-3a-(10a+6)+18=0
We add all the numbers together, and all the variables
8a-(10a+6)+18=0
We get rid of parentheses
8a-10a-6+18=0
We add all the numbers together, and all the variables
-2a+12=0
We move all terms containing a to the left, all other terms to the right
-2a=-12
a=-12/-2
a=+6
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