3. The function $f(x)$ is such that $f(x+1)+f(x-1)=5.2 f(x)$. It is known that $f(0)=-98$, and $\mathrm{f}(3)=249.2$. Find $f(1)$.
Answer: -10

## Examples of how to write answers:

17

$-1.7$

$1 / 7$

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