Simplifying????

Start inside and work your way out:

= -7 [ -50 - ( -96 - 40) ]
= -7 [ -50 - ( - 136) ]
= -7 [ -50 + 136 ]
= -7 [ 86 ]
= -602

- 7 [ - 50 - (- 136) ]
- 7 [ - 50 + 136 ]
- 7 [ 86 ]
- 602

Well done in using brackets to produce such a clear question.
You will note you have been receiving clear answers as a result.
Many do not use brackets and chaos is then the order of the day !

start from the inner brackets and make ur way out.
-7 [ - 50 - ( - 96 - 40) ]
- 7 [ - 50 - ( -136)]
-7 [ -50 + 136 ]
- 7 [ 86]
- 602

GIVEN EXPRESSION[BY APPLYING" BOD MAS" RULE]

----------------
= -7 [ -50 - ( - 136) ]
= -7 [ -50 +136 ]
= -7 [ 86]
= - 602

In order to simplify, you must use the order of operations. I this case start on the inside group and work your way out.

-7 [ - 50 - ( - 96 - 40) ]
- 7 [ - 50 - ( -136)]
-7 [ -50 + 136 ]
- 7 [ 86]
- 602

-7[-50 - (-96 - 40)]
= -7[-50 - (-136)]
= -7[-50 + 136]
= -7[136 - 50]
= -7[86]
= -602

ok...