How does mapping works in additional math, functions?

Im having trouble.find the value of the object that is mapped to itselff(x) = x - 6 or:Im having trouble.'find the value of the object that is mapped

Im having trouble.
'find the value of the object that is mapped to itself'
f(x) = x - 6

or:Im having trouble.'find the value of the object that is mapped to itself'f(x) = x - 6

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