$$56\div8-\{(51+7\times2)-(5\times11-5)\}$$
$-8$
$$7-\left(51+7\times 2-\left(5\times 11-5\right)\right)$$
$$7-\left(51+14-\left(5\times 11-5\right)\right)$$
$$7-\left(65-\left(5\times 11-5\right)\right)$$
$$7-\left(65-\left(55-5\right)\right)$$
$$7-\left(65-50\right)$$
$$7-15$$
$$-8$$
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