Question

How do you simplify `(−3) + (−18) + 30`?

Answer 1

`9`

Explanation:

The parenthesis around `-3` and `-18` are unnecessary, thus we have:

`-3+(color(blue)(-18+30))`

What I have in blue can be rewritten as `30-18`, which is `12`, thus we have:

`12-3`, which is of course `9`.