5-3. Solve the inequality

$$
\sqrt{5 x-11}-\sqrt{5 x^{2}-21 x+21} \geqslant 5 x^{2}-26 x+32
$$

In your answer, specify the sum of all integer values of $x$ that satisfy the inequality.
Solution. The inequality is satisfied by only one integer value: $x=3$.

Answer: (B) 3.

Answer choices.

$$
\begin{array}{|l|l|l|l|l|l|l|l|l|}
\hline \mathbf{A} & 2 & \mathbf{B} & 3 & \mathbf{C} & 5 & \mathbf{D} & 7 & \mathbf{E} \\
\hline
\end{array}
$$