This problem has TWO solutions, not one.
In the post by @MathLover1 second possible solution is LOST.
So I came to bring a full correct solution.
= .........change to base = ........cross multiply
= = ........it implies
= +/-
If = then sqrt(x) = 5; hence, x = 25.
If = - then sqrt(x) = 1/5; hence, x = 1/25.
ANSWER. There are two solutions, x= 25 and/or x = 1/25.