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How do I do this math stuff?

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"We call a function F an 'even function' if, for any number X in the domain of F, -X is also in the domain and F(-X) = F(X). "Suppose F is an even function and the point (3,5) is on the graph of F. What other point do you know must be on the graph of F? Explain."

'F' and 'X' are supposed to be italicized.

I have math how that I have NO idea how to do. Can you help me out?