Argento writes and asks:
"How can I produce numbers with minus symbol at the end of the number?"
In other words, Argento wants to show his numbers with trailing negatives. That is to say, instead of showing -125, he needs to show his numbers as 125-.
I'm not an accountant, so I never really understood why anyone would want to see trailing negatives. To me, it just looks as though you keep forgetting to finish writing your math problem.
Nevertheless, you can force trailing negatives easily with a custom number formatting.