To solve this expression, we need to simplify the expression inside the parentheses first:

2/11 - 6/7

To subtract fractions, we need to have a common denominator. The least common multiple of 11 and 7 is 77. So, we can rewrite the expression as:

(2/11)(7/7) - (6/7)(11/11)
14/77 - 66/77

Now, we can subtract the fractions:

14/77 - 66/77 = (14 - 66)/77 = -52/77

Now, we can substitute this result back into the original expression:

-6/7 - (-52/77)

To subtract fractions, we need to have a common denominator. The least common multiple of 7 and 77 is 539. So, we can rewrite the expression as:

(-6/7)(77/77) - (-52/77)(7/7)
-462/539 + 364/539

Now, we can subtract the fractions:

-462/539 + 364/539 = (-462 + 364)/539 = -98/539

Therefore, -6/7 - (2/11 - 6/7) simplifies to -98/539.