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11=9a-13
We move all terms to the left:
11-(9a-13)=0
We get rid of parentheses
-9a+13+11=0
We add all the numbers together, and all the variables
-9a+24=0
We move all terms containing a to the left, all other terms to the right
-9a=-24
a=-24/-9
a=2+2/3
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