# Problem 4. (3 points)

Given the function $f(x)=x^{2}+3$. Solve the equation $\underbrace{f(f(\ldots(7 x-3) \ldots))}_{10 \text { times }}=\underbrace{f(f(\ldots(x) \ldots))}_{11 \text { times }}$.

If there are multiple solutions, list them all in ascending order, separated by commas or semicolons.
Answer: $-7 ; 0 ; 1 ; 6$

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