Finding the time given an exponential function with base e that models a real-world situation

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I have been watching your videos for a really long time, and they have really helped me for the most part! But, when you put ln (25/82) dived by -0.18 into demos, it is frustrating to me as a student, because I don't know what is happening to make it become 6.59913012442. The reason this is frustrating is on exams, they don't allow you to just toss in the last few calculations.
I have tried making the logs of the numerator and denominator and then diving them and them dividing the quotient by -.18, but I get a different answer. I also have tried dividing 25/82 and then finding the log of that and continuing as normal. Again, different answer. I hope this doesn't come across as mean. It would be helpful if you finished the last few steps on screen. Thank you.

AdrianaCarlos-ug