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120/4-a=12
We move all terms to the left:
120/4-a-(12)=0
determiningTheFunctionDomain -a-12+120/4=0
We add all the numbers together, and all the variables
-1a+18=0
We move all terms containing a to the left, all other terms to the right
-a=-18
a=-18/-1
a=+18
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