TeX джерело:

\begin{array}{l}{\log _{x - 3}}(x - 1) = 2;\;x - 1 = {(x - 3)^2};\;x - 1 = {x^2} - 6x + 9;\;{x^2} - 7x + 10;\;\\x = 5,x = 2.\end{array}