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

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Answer 1 · 2018-03-19T00:32:18

$9$

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 $9$ .

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