Can't understand the process of the blue underlined line U U U - Maths - Indices and Logarithms

Question

Can't understand the process of the blue underlined line

Smart Learner · Answer

Here they converted 5^2x-1 to 5^2x-2 By multiplying it by 5 Because
of this now we have 5^2x-2 as common

Can't understand the process of the blue underlined line . Can't understand the process of the blue underlined line . U U U