# Inverting 4-digits numbers.

Let $$n$$ be a four digits number with non-zero units digit. Let $$f(n)$$ be the number that we get from inverting the order of the digits of $$n$$, for example : $$f(3259)=9523$$.

Find $$n$$ such that $$f(n)=4n+3$$.

Note : remember that $$n$$ is a four digits number with non-zero units digit.

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