Let's break this down step by step.

First, let's simplify the innermost parentheses:

-2 1/3 + 3 7/12

To add these mixed fractions, we need to make sure they have the same denominator:

-2 4/12 + 3 7/12 = -2 4/12 + 3 7/12 = 1 3/12

Now, we can simplify:

1 3/12 = 1 1/4

Now, replacing this back into the original expression:

-1,25 - (6,5 - (1,5 + 1 1/4))

Now simplify the next set of parentheses:

1,5 + 1 1/4 = 1,5 + 1 1/4 = 1,5 + 1,25 = 2,75

Now substitute back into the main expression:

-1,25 - (6,5 - 2,75)

Now simplify the subtraction within the parentheses:

6,5 - 2,75 = 3,75

Now substitute back into the main expression:

-1,25 - 3,75 = -5

Therefore, the final answer is -5.