system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does multiplying two negatives give you a positive?

Thank you guys, I kind of understand it now. Also, thanks to everyone for your replies. I cant read them all but I appreciate it. 

Oh yeah and fuck anyone calling me stupid.
gpt
I give you three $20 notes: +3 &times; +20 = +60 for you

I give you three $20 debts: +3 &times; -20 = -60 for you

I take three $20 notes from you: -3 &times; +20 = -60 for you

I take three $20 debts from you: -3 &times; -20 = +60 for you

Edit: Gold thanks! $ signs, and quick note - the result is the gain or loss from where you started.