Many devices do so, or allow you to do so. Some of the more obvious ones are computers, calculators, and abacuses
It adds and subtracts numbers.
A calculator.
155
the top adds what the bottom adds. the top subtracts what the bottom subtracts. the top divides what the bottom divides. the top multiplies what the bottom multiplies.
An arithmetic operation happens.
12
-1
How about: 10-4 = 6
Almost all tattoos hurt. It is the skill of the tattoo artist that adds or subtracts from the pain.
34
Well, the Pope always adds ans subtracts churches, so He does. But the TRUE answers is God ,Mary, and their Son Jesus.
leibniz