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This is a high school math problem (function)
Methods: x-4 was used to bring in X.

Then f(x-4)=f(x-4-4)=f(x-8).

-f(x)=-f(x-4)

And f(x-4)=-f(x)

∴-f(x)=f(x)

Then f(x-8)=f(x)

Solution: change it to f(x-4-4)=-f(x-4)

f(x-8)=f(x)

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