The number of linear functions f satisfying \[f(x+f(x))=x+f(x)\forall

1.	The number of linear functions f satisfying \[f(x+f(x))=x+f(x)\forall x\in R\] is
A.	0
B.	1
C.	2
D.	3
Answer» D. 3

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The number of linear functions f satisfying \[f(x+f(x))=x+f(x)\forall x\in R\] is

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