52 – 40 = JXUwMDY5JXUwMDAz
75 – 60 = JXUwMDY5JXUwMDA0
84 – 50 = JXUwMDZiJXUwMDA3
JXUwMDZjJXUwMDAz – JXUwMDY5JXUwMDAx = JXUwMDZiJXUwMDA0