$$76 - 4 - [ 6 + \{ 19 - ( 48 - 57 - 17 ) \} ]$$
$21$
$$72-\left(6+19-\left(48-57-17\right)\right)$$
$$72-\left(6+19-\left(-9-17\right)\right)$$
$$72-\left(6+19-\left(-26\right)\right)$$
$$72-\left(6+19+26\right)$$
$$72-\left(6+45\right)$$
$$72-51$$
$$21$$
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$3\times 7$
