$$-10- \{ -2+[+1-(-3-5)+3] \}$$
$-20$
$$-10-\left(-2+1-\left(-8\right)+3\right)$$
$$-10-\left(-2+1+8+3\right)$$
$$-10-\left(-2+9+3\right)$$
$$-10-\left(7+3\right)$$
$$-10-10$$
$$-20$$
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