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-2a+(-6)+4a=18
We move all terms to the left:
-2a+(-6)+4a-(18)=0
determiningTheFunctionDomain -2a+4a-18+(-6)=0
We add all the numbers together, and all the variables
2a-24=0
We move all terms containing a to the left, all other terms to the right
2a=24
a=24/2
a=12
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