$$24 - [ 25 - 26 - \{ ( 27 - 28 - 29 ) \} ]$$
$-5$
$$24-\left(-1-\left(27-28-29\right)\right)$$
$$24-\left(-1-\left(-1-29\right)\right)$$
$$24-\left(-1-\left(-30\right)\right)$$
$$24-\left(-1+30\right)$$
$$24-29$$
$$-5$$
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