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

Mar 19, 2018

$9$

#### Explanation:

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

$- 3 + \left(\textcolor{b l u e}{- 18 + 30}\right)$

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

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