What does Daniel 5:15 mean?

My wise men and magicians couldn’t read this writing or tell me what it means. But I’ve heard you can explain things and solve problems. If you can read this writing and tell me what it means, I’ll give you a purple robe, a gold chain, and make you the third highest ruler in the kingdom. Daniel 5:15 - Modern Text Bible

(Belshazzar offers Daniel rewards and authority if he can interpret the mysterious writing, showing his desperation.)