SOLUTION: What is x if f(x)=18?

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Question 953825: What is x if f(x)=18?
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
The question means nothing until you have a function definition. What is f(x)?

Plainly not enough information is given. x cannot be found if no definition is given for f(x). MORE information needs to be part of the problem description.