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11a-9=5a+21
We move all terms to the left:
11a-9-(5a+21)=0
We get rid of parentheses
11a-5a-21-9=0
We add all the numbers together, and all the variables
6a-30=0
We move all terms containing a to the left, all other terms to the right
6a=30
a=30/6
a=5
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