# Question 65de7

Sep 6, 2017

(-23)-[(-25)-{(-17-(-19)}=4#

#### Explanation:

Wow, that's a lot of brackets and parentheses!!
It's important to remember that all these brackets may as well be parentheses. The person who wrote the question just wanted to make it less confusing by using different kinds of brackets. (Ha!)

Start with $\left(- 23\right)$, which is just $- 23$. The minus sign after that changes the negative (or minus) signs that aren't in other sets of brackets. Making those changes gives us:
$- 23 + 25 + \left\{- 17 - \left(- 19\right)\right\} = 2 + \left\{- 17 - \left(- 19\right)\right\}$
Look at the stuff still in brackets:
You know that $- 17 - \left(- 19\right) = - 17 + 19 = 2$, so the expression simplifies more to $2 + 2 = 4$.

...and we're done!