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11=23-4a
We move all terms to the left:
11-(23-4a)=0
We add all the numbers together, and all the variables
-(-4a+23)+11=0
We get rid of parentheses
4a-23+11=0
We add all the numbers together, and all the variables
4a-12=0
We move all terms containing a to the left, all other terms to the right
4a=12
a=12/4
a=3
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