How do i solve log6 (25) - log6 (5)

There's nothing there to solve. But you can simplify the expression.

- - The difference of two logs is the log of the quotient.

log₆ (25) - log₆ (5)

= log₆ (25/5) = log₆ (5).

That may be all you can do with it.

If they want you to go ahead and actually find the value of log₆ (5) ...

I don't remember how to do that. If it was log₁₀ (5) or ln (5),

those would be easy, because they're right on your calculator.

But the log to the base of (anything else other than 10 or 'e') takes

an additional step, which I don't remember.