find the value of $- 12 - (- 48) - [(- 13) + (- 8) - (- 3) + 4]$

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Solution

We have
$- 12 - (- 48) - [(- 13) + (- 8) - (- 3) + 4]$
$= - 12 + 48 - [- 13 - 8 + 3 + 4]$ [ $∵ - (- a) = a$ ]
$= 36 - [- 21 + 12]$
$= 36 - [- 9]$
$= 36 + 9$
$= 45$

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