Question

How to solve this problem

Answer 1

L-5l+l9l=

5+9=14

and done :P

Answer 2

14

Actually it's quite simple, |x| these brackets mean absolute value. Absolute value means the sign doesn't matter when it's inside the brackets. The answer of x will always be positive (when inside!)

Using this rule:
|-5|+|9|
5+9
14