$$6-13+(-17-(-22)-(-40)$$
$38$
$$-7+-17-\left(-22\right)-\left(-40\right)$$
$$-7+-17+22-\left(-40\right)$$
$$-7+5-\left(-40\right)$$
$$-7+5+40$$
$$-7+45$$
$$38$$
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$2\times 19$