Question

How do you find the sum `18+(-32)`?

Answer 1

`-14`

Explanation:

-32 is the number which added to 32 equals zero.
`-32 = x, x + 32 = 32 + x = 0`

You want `18 + x = 32 - y + x = 0 - y`

`18 = 32 - y \Rightarrow y = 32 - 18 = 14`

But you want `0 - y = -14`