riddle me this riddle me that!


How do you subtract seven from five, and end up with four? (incredibly difficult, took me 3 hours)
A similar question: how do you subtract 2 from 5 and end up with 4?

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣼⢻⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⢠⣀⣀⣀⣀⣰⡇⠈⣧⣀⣀⣀⣀⣀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠻⢦⡀⠀⠀⠀⠀⢀⣠⠾⠋⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣹⠃⠀⠀⠀⢿⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⣠⠔⠀⠀⠀⠀⢠⣏⣤⠞⠛⢦⣜⣧⠀⠀⠀⠀⠢⣄⠀⠀⠀⠀⠀
⠀⠀⢠⣖⡿⡋⠀⠀⠀⠀⠀⠾⠋⠀⠀⠀⠀⠉⠻⡄⠀⠀⠀⠀⢝⢿⣱⡄⠀⠀
⠀⡜⣿⣨⡾⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠁⠲⣤⡀⠀⠀⠀⠀⠀⠈⢳⣇⣿⢡⠀
⢰⣇⣟⣵⠃⠀⠀⠀⠀⠀⠀⢀⣴⣤⡤⠀⠀⠈⠻⣷⡀⠀⠀⠀⠀⠈⣯⡻⢸⡆
⡎⣿⡾⡅⠀⠀⠀⠀⠀⠀⣴⣿⣿⣏⠀⠀⠀⠀⠀⠹⣿⡆⠀⠀⠀⠀⢨⢿⣾⢡
⣷⡘⣱⠇⠀⠀⠀⠀⠀⠀⠹⠋⠈⠻⣷⣄⠀⠀⠀⠀⣿⣿⠀⠀⠀⠀⠘⣧⢋⣾
⡼⣷⡿⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠻⣷⣄⠀⢀⣿⣿⠀⠀⠀⠀⢸⢻⣾⢇
⢳⣜⠇⣿⠀⠀⠀⠀⠀⠀⣴⢶⣤⣀⡀⠀⠈⢻⣷⣾⣿⠏⠀⠀⠀⠀⣿⠸⣣⡞
⠀⡿⢷⣿⠸⡄⠀⠀⣴⡾⠉⠀⠉⠛⠿⢿⣿⣿⡿⢿⣷⣄⠀⠀⢠⡇⣿⡾⢋⠀
⠀⠘⢦⣝⡣⢿⡤⡘⠛⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠙⠋⢀⣤⡿⢘⣭⡴⠃⠀
⠀⠀⠀⠹⡛⠾⠷⡹⣦⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣴⢟⠾⠿⣛⠏⠀⠀⠀
⠀⠀⠀⠀⠈⠻⡿⠿⠶⢛⣓⣤⡶⣖⡶⠶⣒⠶⣦⣜⣛⠲⠿⢿⡛⠁⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠈⠛⠛⠛⠛⢡⠞⠁⠀⠀⠈⠳⣮⠙⠛⠛⠛⠁⠀⠀⠀⠀⠀⠀