Answer:
x = 4
Explanation:

First you need to get a common base as your number.

The second number changed because 5 squared is 25. Changing it to this form gives us the same base number of 5. Now we use the distributive property in the exponent.

Now we can use this statement:
if

Using this we solve:
9x = 8x+4
-8x -8x
x = 4
Hope it helps!