Simplify :-
-7 – [5 – {2 – 5(8 ÷ 4 – 2)}]
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= -7 - [ 5 - { 2 - 5 ( 8 ÷ 4 - 2 ) } ]
= -7 - [ 5 - { 2 - 5 ( 2 ) } ]
= -7 - [ 5 - { -6 } ]
= -7 - [11]
= - 18
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