$$5-[5-\{5-(5-5-5)\}]$$
$10$
$$5-\left(5-\left(5-\left(-5\right)\right)\right)$$
$$5-\left(5-\left(5+5\right)\right)$$
$$5-\left(5-10\right)$$
$$5-\left(-5\right)$$
$$5+5$$
$$10$$
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$2\times 5$