Question 573051
Not sure what you're looking for from me, since you need to work the problem starting with the innermost parens and going out from there ... 


-6 - [-7 + (2 - 3)]
-6 - [-7 + (-1)]
-6 - [-8]  converting the double negative to a positive ... 
-6 + 8
2


Hope this helps.  If there's some part of a problem giving you trouble, you can say that in your question so we can help you better.  Good luck!!  :-)