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4*1-a=18
We move all terms to the left:
4*1-a-(18)=0
determiningTheFunctionDomain -a-18+4*1=0
We add all the numbers together, and all the variables
-1a-14=0
We move all terms containing a to the left, all other terms to the right
-a=14
a=14/-1
a=-14
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