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Mathematics
Mathematics
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 .....}
f
(
x
+
f
(
x
))
=
x
+
f
(
x
)
,
∀
x
is .....
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