Insert parentheses in 5+4x2+6-2x2-1 so that it has a value of 19. then show why your expression has a value of 19

Given the expression  

5 + 4 × 2 + 6 - 2 × 2 - 1

We would want to insert the parentheses for the sum that is not division or multiplication so we can work out the sum inside the parentheses first. We have the option to insert the parentheses either for '5 + 4' or for '2 + 6' or for '6 - 2' or for '2 - 1' 

Using trial and error:

(5 + 4) × 2 + 6 - 2 × 2 - 1 ⇒ Working this out following BIDMAS
9 × 2 + 6 - 2 × 2 - 1
18 + 6 - 4 - 1
24 - 4 - 1
19

The parentheses inserted for the sum 5 + 4 gives the answer 19