The given equation can be simplified using the properties of logarithms. The sum of two natural logarithms with the same base is equal to the natural logarithm of their product. Therefore, 2 ln 5 + ln 5 can be rewritten as ln (5^2) + ln 5, which is equal to ln (25) + ln 5. Using the property of logarithms again, the sum of two logarithms is equal to the logarithm of their product. So, ln (25) + ln 5 can be rewritten as ln (25 * 5), which is equal to ln (125). Finally, the equation becomes 3 ln (x - 1) = ln (125). By equating the arguments of the logarithms, we get x - 1 = 125. Solving for x, we find x = 126.