If f is a real function defined by f (x)=x-1/×+1 then prove that f (2x)=3f(x)-1/3f (x)+1?

If f is a real function defined by f (x)=x-1/×+1 then prove that f (2

1.	If f is a real function defined by f (x)=x-1/×+1 then prove that f (2x)=3f(x)-1/3f (x)+1?
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