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38+29-20a=12a-47
We move all terms to the left:
38+29-20a-(12a-47)=0
We add all the numbers together, and all the variables
-20a-(12a-47)+67=0
We get rid of parentheses
-20a-12a+47+67=0
We add all the numbers together, and all the variables
-32a+114=0
We move all terms containing a to the left, all other terms to the right
-32a=-114
a=-114/-32
a=3+9/16
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