$$3-[(12+5-13)-(9+3)]$$
$11$
$$3-\left(17-13-\left(9+3\right)\right)$$
$$3-\left(4-\left(9+3\right)\right)$$
$$3-\left(4-12\right)$$
$$3-\left(-8\right)$$
$$3+8$$
$$11$$
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