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

MATHEMATICS · Subjective · ISC · Mathematics · Algebra · Solving quadratic equations

Problem

The number of linear functions satisfying f(x+f(x))=x+f(x),∀x is .....f(x + f(x)) = x + f(x), \forall x \text{ is .....}

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