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