$$17-[525\div5+3\times4-(6+5)\}]$$
$11$
$$17-\left(5+3\times 4-\left(6+5\right)\right)$$
$$17-\left(5+12-\left(6+5\right)\right)$$
$$17-\left(17-\left(6+5\right)\right)$$
$$17-\left(17-11\right)$$
$$17-6$$
$$11$$
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