the way you typed it:
5^n+3/25^2n-3=1
5^n+(3/625)n-3=1
5^n + (3/625)n - 4 = 0
very messy to solve:
even Wolfram had difficulties:
https://www.wolframalpha.com/input/?i=solve+5%5En+%2B+(3%2F625)n+%3D+4
did you mean ...
5^n+3/25^(2n) - 3=1 ?
or
5^n+3/25^(2n-3) = 1 ??
or
....
clearly this needs brackets
5^n+3/25^2n-3=1
1 answer