\[\boxed{\mathbf{6.}}\]
\[\left\{ \begin{matrix} \log_{2}(x - 5) - \sin\text{πx} = 0 \\ x - 6 = 0\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \end{matrix} \right.\ \]
\[x - 6 = 0\]
\[x = 6.\]
\[Подставим:\]
\[\log_{2}(6 - 5) - \sin{6\pi} =\]
\[= 0 - 0 = 0.\]
\[Удовлетворяет.\]
\[Ответ:x = 6.\]
\[\left\{ \begin{matrix} \log_{3}(x - 2) - \sin\frac{\text{πx}}{2} = 0 \\ x - 5 = 0\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \end{matrix} \right.\ \]
\[x - 5 = 0\]
\[x = 5.\]
\[Подставим:\]
\[\log_{3}(5 - 2) - \sin\frac{5\pi}{2} =\]
\[= 1 - 1 = 0.\]
\[Удовлетворяет.\]
\[Ответ:x = 5.\]