To simplify this expression, we need to follow the order of operations (PEMDAS).

First, let's simplify the expression inside the parentheses:

1/1/2 = 1/2
-2/7 = -2/7
-14/8 = -7/4

Now, let's substitute these values back into the expression:

-5/15 - (1/2 - (-2/7) - (-7/4)) - 11/3

Next, let's simplify the expression inside the parentheses:

1/2 - (-2/7) = 1/2 + 2/7 = 7/14 + 4/14 = 11/14
11/14 - (-7/4) = 11/14 + 7/4 = 11/14 + 49/14 = 60/14 = 30/7

Now, substitute these values back into the expression:

-5/15 - 30/7 - 11/3

Next, let's find a common denominator for the fractions:

-5/15 = -1/3
30/7 = 30/7
11/3 = 11/3

Now, substitute these values back into the expression:

-1/3 - 30/7 - 11/3

To add these fractions, we need to find a common denominator, which is 21:

-7/21 - 90/21 - 77/21

Now, add the fractions:

-7 - 90 - 77 = -174

Therefore, the simplified expression is -174/21 or -58/7.