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28/4-a=12
We move all terms to the left:
28/4-a-(12)=0
determiningTheFunctionDomain -a-12+28/4=0
We add all the numbers together, and all the variables
-1a-5=0
We move all terms containing a to the left, all other terms to the right
-a=5
a=5/-1
a=-5
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