No problem. I'll try to explain it further.
What I have done is say that 3 is equal to
log28. In your first lessons on logarithms, you should have learnt why this is true. Put
log28 into your calculator to convince yourself if you're still not sure.
Remember,
log221=1,log222=2,log223=3 etc.
Next I have just replaced 3 with
log28, since they are the same thing.