Answer:

Step-by-step explanation:
First of all we will start with the brackets inside the equation,
1. ![2[16+40+12x]](https://tex.z-dn.net/?f=2%5B16%2B40%2B12x%5D)
Now we can multiply 2 by all the values inside the parentheses
2. 
I just wanted to confirm that the big X is a variable?
Fact: Did you know that there are about 4 types of parenthese: ( ) - round brackets, [ ] - square brackets, { } - curly brackets, and < > - angle bracket.