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240-2x=(x)
We move all terms to the left:
240-2x-((x))=0
determiningTheFunctionDomain -2x-x+240=0
We add all the numbers together, and all the variables
-3x+240=0
We move all terms containing x to the left, all other terms to the right
-3x=-240
x=-240/-3
x=+80
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